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Date: Tue, 1 May 2012 16:02:02 -0400
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--=_alternative 006E0D23852579F1_=--

From ecnoel@research.att.com  Wed May  2 06:38:26 2012
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From: "NOEL, ERIC C (ERIC C)" <ecnoel@research.att.com>
To: 'Volker Hilt' <volker.hilt@bell-labs.com>, "'sip-overload@ietf.org'" <sip-overload@ietf.org>
Date: Wed, 2 May 2012 09:39:30 -0400
Thread-Topic: [sip-overload] comments on draft-ietf-soc-overload-rate-control-01
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Volker,

Phil, Janet and I worked out the following response to provide better clari=
fication on the meaning of Tau, Tau1 and Tau2:

The tolerance parameter Tau determines how close the long-term admitted rat=
e is to an ideal control that would admit all SIP requests for arrival rate=
s less than 1/T and then admit SIP requests precisely rate at 1/T for arriv=
al rates above 1/T. In particular at mean arrival rates close to 1/T, it de=
termines the tolerance to deviation of the inter-arrival time from T (the l=
arger Tau the more tolerance to deviations from the inter-departure interva=
l T). =20

This deviation from the inter-departure interval influences the admitted ra=
te burstyness, or the number consecutive SIP requests forwarded to the SIP =
server (burst size proportional to Tau over the difference between 1/T and =
the arrival rate).

SIP servers with a very large number of clients, each with a relatively sma=
ll arrival rate, will generally benefit from a smaller value for Tau in ord=
er to limit queuing (and hence response times) at the server when subjected=
 to a sudden surge of traffic from all clients.  Conversely, a SIP server w=
ith a relatively small number of clients, each with proportionally larger a=
rrival rate, will benefit from a larger value of Tau.

With a priority scheme that relies on two tolerance parameters (Tau2 influe=
nces the priority traffic, Tau1 influences the non-priority traffic), alway=
s set Tau1 <=3D Tau2 (Tau is replaced by Tau1 and Tau2).  Setting both tole=
rance parameters to the same value is equivalent to having no priority. Tau=
1 influences the admitted rate the same way as Tau does when no priority ar=
e set. And the larger the difference between Tau1 and Tau2, the closer to t=
he control is to strict priority.

Tau (or Tau1 and Tau2) can assume any positive real number value and is not=
 necessarily bounded by T.  =20
 =20
Then for the pseudo code (C-like syntax):

Pseudo code (no priority case):=20
   =20
    // T: emission interval, set to 1 / TargetRate=20
    // tau:  tolerance parameter=20
    // t_a: arrival time of last arrival=20
   // LCT:  arrival time of last conforming SIP request (initialized to the=
 first arrival time)=20
   // X: current value of leaky bucket counter (initialized to 0)=20
  =20
   // After first arrival, calculate auxiliary variable Xp=20
    Xp =3D X - (t_a - LCT);=20
    =20
    if (Xp <=3D tau) {  =20
      // Accept SIP request=20
     // Update X and LCT      =20
      X =3D max(0,Xp) + T;      =20
      LCT =3D t_a;=20
    } else {=20
      // Reject SIP request=20
      // Do not update X and LCT    =20
    }=20
    =20
Pseudo code (priority case):=20
  =20
    // T: emission interval, set to 1 / TargetRate=20
    // tau1:  tolerance parameter of no priority SIP requests=20
    // tau2:  tolerance parameter of priority SIP requests=20
    // t_a: arrival time of last arrival=20
   // LCT:  arrival time of last conforming SIP request (initialized to the=
 first arrival time)=20
   // X: current value of leaky bucket counter (initialized to 0)=20
  =20
   // After first arrival, calculate auxiliary variable Xp=20
    Xp =3D X - (t_a - LCT);=20
    =20
  if (AnyRequestReceived && Xp <=3D tau1 || PriorityRequestReceived && Xp <=
=3D tau2 && Xp > tau1) {=20
      // Accept SIP request=20
     // Update X and LCT      =20
      X =3D max(0,Xp) + T;=20
      LCT =3D t_a;=20
    } else {=20
      // Reject SIP request=20
      // Do not update X and LCT    =20
    }

Note that we intend to update our contribution with the above text.

Additional comments and/or suggestions are welcome.

Thanks,

Eric Noel=20
AT&T Labs, Inc.=20
Rethink Possible

Network Design and Performance Analysis
200 South Laurel Avenue, D5-3D19
Middletown, NJ 07748
P: 732.420.4174
ecnoel@att.com


-----Original Message-----
From: NOEL, ERIC C (ERIC C)=20
Sent: Thursday, April 05, 2012 5:24 PM
To: 'Volker Hilt'; sip-overload@ietf.org
Cc: 'phil.m.williams@bt.com'; jgunn6@csc.com
Subject: RE: [sip-overload] comments on draft-ietf-soc-overload-rate-contro=
l-01

Volker,

Apologies for the delayed response.  Phil is away and could not provide inp=
ut to below, and I am about to go away as well. So I am giving you partial =
responses which I will complete upon my return. Janet also provided some in=
put in below.

- Section 3.4.:
   But when deriving this rate the server may need to
   take into account the effect of the client prioritization on the
   load it receives, e.g. CPU utilization will depend upon the
   characteristics of the requests.
How should the server take the client prioritization into account? Does the=
 server need to know the prioritization made by the client?
[EN/JG] The server does not know the client(s) prioritization rules, but it=
 could account for it implicitly  by relying on a resource measure such as =
the average CPU load per request due to the particular request stream mix r=
esulting from the client's admission control.  Using this measure would all=
ow the server to take into account the client prioritization. =20

- Section 3.5.:
What is the adjusted-oc-value? Is this the value received in the oc paramet=
er? How will it be adjusted?
[EN/JG] The parameter "adjusted-oc-value" is a typo, should be "oc-value". =
Will be changed in the next version.


How should the values TAU1 and TAU2 be set with respect to the overall TAU?=
 Can you give guidance on how they should be chosen? What will they depend =
on?
[EN/JG] Putting together a small model to produce guidance on parameter sel=
ection.=20

It would be very helpful to have a pseudo-code algorithm for rate based con=
trols. This will make the description in this section easier to understand.
[EN/JG] Will be added in next version.

Eric Noel=20
AT&T Labs, Inc.=20
Rethink Possible

Network Design and Performance Analysis
200 South Laurel Avenue, D5-3D19
Middletown, NJ 07748
P: 732.420.4174
ecnoel@att.com


-----Original Message-----
From: sip-overload-bounces@ietf.org [mailto:sip-overload-bounces@ietf.org] =
On Behalf Of Volker Hilt
Sent: Tuesday, March 27, 2012 1:23 PM
To: sip-overload@ietf.org
Subject: [sip-overload] comments on draft-ietf-soc-overload-rate-control-01

Eric, Phil,

here are a few comments on draft-ietf-soc-overload-rate-control-01:

- Section 3.4.:

    But when deriving this rate the server may need to
    take into account the effect of the client prioritization on the
    load it receives, e.g. CPU utilization will depend upon the
    characteristics of the requests.

How should the server take the client prioritization into account? Does the=
 server need to know the prioritization made by the client?

- Section 3.5.:

What is the adjusted-oc-value? Is this the value received in the oc paramet=
er? How will it be adjusted?

How should the values TAU1 and TAU2 be set with respect to the overall TAU?=
 Can you give guidance on how they should be chosen? What will they depend =
on?

It would be very helpful to have a pseudo-code algorithm for rate based con=
trols. This will make the description in this section easier to understand.

Thanks,

Volker

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Cc: "sip-overload@ietf.org" <sip-overload@ietf.org>
Subject: Re: [sip-overload] comments on draft-ietf-soc-overload-rate-control-01
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From:   "NOEL, ERIC C (ERIC C)" <ecnoel@research.att.com>
To:     Janet P Gunn/USA/CSC@CSC, "sip-overload@ietf.org" 
<sip-overload@ietf.org>
Date:   05/07/2012 10:01 AM
Subject:        RE: [sip-overload] comments on 
draft-ietf-soc-overload-rate-control-01



Janet,
 
Thanks for your comments. Please see below our response.
 
Thanks,
 
Eric Noel 
AT&T Labs, Inc. 
Rethink Possible
 
Network Design and Performance Analysis
200 South Laurel Avenue, D5-3D19
Middletown, NJ 07748
P: 732.420.4174
ecnoel@att.com
 
 
These are largely editorial comments. 
...

Sec 3.4 
...
 
4th para 
Note that the target SIP request rate is a max rate that may not be 
   attained by the arrival rate at the client, and the server cannot 
   assume that it will. 
To 
Note that the target SIP request rate is an upper bound on the rate the 
client may send requests to the server.  In many cases, the client will 
send messages at a lower rate. 
> Suggested writing is different than original paragraph meaning. 
Originally that paragraph stated the server should not assume the arrival 
rate at client will exceed the server target rate. Your suggested change 
does away with the observation on the arrival rate at client and focuses 
on the arrival rate presented by the client to the server. 
Was that the intent?

[JPG] I guess I am confused.  Why would the server care what  the arrival 
rate at the client is?  Why would the server assume that the arrival rate 
at the client ( which may be distributed among many different servers) 
would, or would not, be bigger that the server target rate?



Janet 
 


--=_alternative 0052F453852579F7_=
Content-Type: text/html; charset="US-ASCII"

<font size=2 face="sans-serif"><br>
</font>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">From: &nbsp; &nbsp; &nbsp;
&nbsp;</font><font size=1 face="sans-serif">&quot;NOEL, ERIC C
(ERIC C)&quot; &lt;ecnoel@research.att.com&gt;</font>
<br><font size=1 color=#5f5f5f face="sans-serif">To: &nbsp; &nbsp; &nbsp;
&nbsp;</font><font size=1 face="sans-serif">Janet P Gunn/USA/CSC@CSC,
&quot;sip-overload@ietf.org&quot; &lt;sip-overload@ietf.org&gt;</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Date: &nbsp; &nbsp; &nbsp;
&nbsp;</font><font size=1 face="sans-serif">05/07/2012 10:01 AM</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Subject: &nbsp; &nbsp;
&nbsp; &nbsp;</font><font size=1 face="sans-serif">RE: [sip-overload]
comments on draft-ietf-soc-overload-rate-control-01</font>
<br>
<hr noshade>
<br>
<br>
<br><font size=2 color=#004080 face="Calibri">Janet,</font>
<br><font size=2 color=#004080 face="Calibri">&nbsp;</font>
<br><font size=2 color=#004080 face="Calibri">Thanks for your comments.
Please see below our response.</font>
<br><font size=2 color=#004080 face="Calibri">&nbsp;</font>
<br><font size=2 color=#004080 face="Calibri">Thanks,</font>
<br><font size=2 color=#004080 face="Calibri">&nbsp;</font>
<br><font size=1 color=#ff8100 face="Verdana">Eric Noel</font><font size=1 color=#5f5f5f face="Verdana">
</font>
<br><font size=1 color=#5f5f5f face="Verdana"><b>AT&amp;T Labs, Inc.</b>
</font><font size=1 color=#00a1e0 face="Verdana"><i><br>
Rethink Possible</i></font>
<br><font size=1 color=#00a1e0 face="Verdana"><i>&nbsp;</i></font>
<br><font size=1 color=#5f5f5f face="Verdana">Network Design and Performance
Analysis<br>
200 South Laurel Avenue, D5-3D19<br>
Middletown, NJ 07748<br>
P: 732.420.4174</font>
<br><a href=mailto:jsmith@att.com><font size=1 color=blue face="Verdana"><u>ecnoel@att.com</u></font></a>
<br><font size=2 color=#004080 face="Calibri">&nbsp;</font>
<br><font size=3 face="Times New Roman">&nbsp;</font>
<br><font size=2 face="Arial">These are largely editorial comments.</font><font size=3 face="Times New Roman">
<br>
...</font>
<br><font size=2 face="Arial"><br>
Sec 3.4</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
...</font>
<br><font size=2 color=#004080 face="Calibri">&nbsp;</font>
<br><font size=2 face="Arial">4th para</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
Note that the target SIP request rate is a max rate that may not be</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
 &nbsp; attained by the arrival rate at the client, and the server cannot</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
 &nbsp; assume that it will.</font><font size=3 face="Times New Roman">
</font><font size=2 face="Arial"><br>
To</font><font size=3 face="Times New Roman"> </font><font size=2 face="Arial"><br>
Note that the target SIP request rate is an upper bound on the rate the
client may send requests to the server. &nbsp;In many cases, the client
will send messages at a lower rate.</font><font size=3 face="Times New Roman">
</font><font size=3 color=red face="Times New Roman"><br>
&gt; Suggested writing is different than original paragraph meaning. Originally
that paragraph stated the server should not assume the arrival rate at
client will exceed the server target rate. Your suggested change does away
with the observation on the arrival rate at client and focuses on the arrival
rate presented by the client to the server. </font>
<br><font size=3 color=red face="Times New Roman">Was that the intent?</font>
<br><font size=2 face="Arial"><br>
</font><font size=3 color=#008000 face="Times New Roman">[JPG] I guess
I am confused. &nbsp;Why would the server care what &nbsp;the arrival rate
at the client is? &nbsp;Why would the server assume that the arrival rate
at the client ( which may be distributed among many different servers)
would, or would not, be bigger that the server target rate?</font>
<br>
<br><font size=2 face="Arial"><br>
<br>
Janet</font><font size=3 face="Times New Roman"> </font>
<br><font size=2 face="Tahoma"><b>&nbsp;</b></font>
<br>
<br>
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From: "NOEL, ERIC C (ERIC C)" <ecnoel@research.att.com>
To: 'Janet P Gunn' <jgunn6@csc.com>, "NOEL, ERIC C (ERIC C)" <ecnoel@att.com>
Date: Tue, 22 May 2012 09:25:34 -0400
Thread-Topic: [sip-overload] comments on draft-ietf-soc-overload-rate-control-01
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Cc: "sip-overload@ietf.org" <sip-overload@ietf.org>
Subject: Re: [sip-overload] comments on draft-ietf-soc-overload-rate-control-01
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Janet,

Thanks for your follow-up comment.

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
4th para
Note that the target SIP request rate is a max rate that may not be
  attained by the arrival rate at the client, and the server cannot
  assume that it will.
To
Note that the target SIP request rate is an upper bound on the rate the cli=
ent may send requests to the server.  In many cases, the client will send m=
essages at a lower rate.
> Suggested writing is different than original paragraph meaning. Originall=
y that paragraph stated the server should not assume the arrival rate at cl=
ient will exceed the server target rate. Your suggested change does away wi=
th the observation on the arrival rate at client and focuses on the arrival=
 rate presented by the client to the server.
Was that the intent?

[JPG] I guess I am confused.  Why would the server care what  the arrival r=
ate at the client is?  Why would the server assume that the arrival rate at=
 the client ( which may be distributed among many different servers) would,=
 or would not, be bigger that the server target rate?
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Another interpretation of the contentious paragraph is that because the cli=
ent Leaky Bucket will not throttle offered load below the target SIP reques=
t rate, the server does not need to make any immediate adjustments for such=
 situations. This is in contrast with percent blocking where blocking is ap=
plied by clients whether or not the offered load presented to clients is be=
low the server overload limit.

Thanks,

Eric Noel
AT&T Labs, Inc.
Rethink Possible

Network Design and Performance Analysis
200 South Laurel Avenue, D5-3D19
Middletown, NJ 07748
P: 732.420.4174
ecnoel@att.com<mailto:jsmith@att.com>

From: Janet P Gunn [mailto:jgunn6@csc.com]
Sent: Monday, May 07, 2012 11:06 AM
To: NOEL, ERIC C (ERIC C)
Cc: sip-overload@ietf.org
Subject: RE: [sip-overload] comments on draft-ietf-soc-overload-rate-contro=
l-01






From:        "NOEL, ERIC C (ERIC C)" <ecnoel@research.att.com<mailto:ecnoel=
@research.att.com>>
To:        Janet P Gunn/USA/CSC@CSC, "sip-overload@ietf.org<mailto:sip-over=
load@ietf.org>" <sip-overload@ietf.org<mailto:sip-overload@ietf.org>>
Date:        05/07/2012 10:01 AM
Subject:        RE: [sip-overload] comments on draft-ietf-soc-overload-rate=
-control-01
________________________________



Janet,

Thanks for your comments. Please see below our response.

Thanks,

Eric Noel
AT&T Labs, Inc.
Rethink Possible

Network Design and Performance Analysis
200 South Laurel Avenue, D5-3D19
Middletown, NJ 07748
P: 732.420.4174
ecnoel@att.com<mailto:jsmith@att.com>


These are largely editorial comments.
...

Sec 3.4
...

4th para
Note that the target SIP request rate is a max rate that may not be
  attained by the arrival rate at the client, and the server cannot
  assume that it will.
To
Note that the target SIP request rate is an upper bound on the rate the cli=
ent may send requests to the server.  In many cases, the client will send m=
essages at a lower rate.
> Suggested writing is different than original paragraph meaning. Originall=
y that paragraph stated the server should not assume the arrival rate at cl=
ient will exceed the server target rate. Your suggested change does away wi=
th the observation on the arrival rate at client and focuses on the arrival=
 rate presented by the client to the server.
Was that the intent?

[JPG] I guess I am confused.  Why would the server care what  the arrival r=
ate at the client is?  Why would the server assume that the arrival rate at=
 the client ( which may be distributed among many different servers) would,=
 or would not, be bigger that the server target rate?



Janet


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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue vli=
nk=3Dpurple><div class=3DWordSection1><p class=3DMsoNormal><span style=3D'f=
ont-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Janet,<o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;fon=
t-family:"Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></span></p>=
<p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri",=
"sans-serif";color:#1F497D'>Thanks for your follow-up comment.<o:p></o:p></=
span></p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"=
Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=
=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri","sans-se=
rif";color:#1F497D'>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<=
o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size:10.0pt;f=
ont-family:"Arial","sans-serif"'>4th para</span> <span style=3D'font-size:1=
0.0pt;font-family:"Arial","sans-serif"'><br>Note that the target SIP reques=
t rate is a max rate that may not be</span> <span style=3D'font-size:10.0pt=
;font-family:"Arial","sans-serif"'><br>&nbsp; attained by the arrival rate =
at the client, and the server cannot</span> <span style=3D'font-size:10.0pt=
;font-family:"Arial","sans-serif"'><br>&nbsp; assume that it will.</span> <=
span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><br>To</sp=
an> <span style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><br>N=
ote that the target SIP request rate is an upper bound on the rate the clie=
nt may send requests to the server. &nbsp;In many cases, the client will se=
nd messages at a lower rate.</span> <span style=3D'color:red'><br>&gt; Sugg=
ested writing is different than original paragraph meaning. Originally that=
 paragraph stated the server should not assume the arrival rate at client w=
ill exceed the server target rate. Your suggested change does away with the=
 observation on the arrival rate at client and focuses on the arrival rate =
presented by the client to the server. </span><br><span style=3D'color:red'=
>Was that the intent?</span> <br><span style=3D'font-size:10.0pt;font-famil=
y:"Arial","sans-serif"'><br></span><span style=3D'color:green'>[JPG] I gues=
s I am confused. &nbsp;Why would the server care what &nbsp;the arrival rat=
e at the client is? &nbsp;Why would the server assume that the arrival rate=
 at the client ( which may be distributed among many different servers) wou=
ld, or would not, be bigger that the server target rate?</span> <br><span s=
tyle=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span>=
</p><p class=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calib=
ri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoN=
ormal><span style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";co=
lor:#1F497D'>Another interpretation of the contentious paragraph is that be=
cause the client Leaky Bucket will not throttle offered load below the targ=
et SIP request rate, the server does not need to make any immediate adjustm=
ents for such situations. This is in contrast with percent blocking where b=
locking is applied by clients whether or not the offered load presented to =
clients is below the server overload limit. <o:p></o:p></span></p><p class=
=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri","sans-se=
rif";color:#1F497D'><o:p>&nbsp;</o:p></span></p><p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'=
>Thanks,<o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-size=
:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:p>=
</span></p><p class=3DMsoNormal><span style=3D'font-size:9.0pt;font-family:=
"Verdana","sans-serif";color:#F47B20'>Eric Noel</span><span style=3D'font-s=
ize:9.0pt;font-family:"Verdana","sans-serif";color:#666666'> <o:p></o:p></s=
pan></p><p class=3DMsoNormal><b><span style=3D'font-size:9.0pt;font-family:=
"Verdana","sans-serif";color:#666666'>AT&amp;T Labs, Inc.</span></b><span s=
tyle=3D'font-size:9.0pt;font-family:"Verdana","sans-serif";color:#666666'> =
<br></span><i><span style=3D'font-size:9.0pt;font-family:"Verdana","sans-se=
rif";color:#00B0E0'>Rethink Possible<o:p></o:p></span></i></p><p class=3DMs=
oNormal><i><span style=3D'font-size:9.0pt;font-family:"Verdana","sans-serif=
";color:#00B0E0'><o:p>&nbsp;</o:p></span></i></p><p class=3DMsoNormal><span=
 style=3D'font-size:9.0pt;font-family:"Verdana","sans-serif";color:#666666'=
>Network Design and Performance Analysis<br>200 South Laurel Avenue, D5-3D1=
9<br>Middletown, NJ 07748<br>P: 732.420.4174<o:p></o:p></span></p><p class=
=3DMsoNormal><span style=3D'font-size:11.0pt;font-family:"Calibri","sans-se=
rif";color:#1F497D'><a href=3D"mailto:jsmith@att.com"><span style=3D'font-s=
ize:9.0pt;font-family:"Verdana","sans-serif"'>ecnoel@att.com</span></a></sp=
an><span style=3D'font-size:11.0pt;font-family:"Verdana","sans-serif";color=
:#1F497D'><o:p></o:p></span></p><p class=3DMsoNormal><span style=3D'font-si=
ze:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p>&nbsp;</o:=
p></span></p><p class=3DMsoNormal><b><span style=3D'font-size:10.0pt;font-f=
amily:"Tahoma","sans-serif"'>From:</span></b><span style=3D'font-size:10.0p=
t;font-family:"Tahoma","sans-serif"'> Janet P Gunn [mailto:jgunn6@csc.com] =
<br><b>Sent:</b> Monday, May 07, 2012 11:06 AM<br><b>To:</b> NOEL, ERIC C (=
ERIC C)<br><b>Cc:</b> sip-overload@ietf.org<br><b>Subject:</b> RE: [sip-ove=
rload] comments on draft-ietf-soc-overload-rate-control-01<o:p></o:p></span=
></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><p class=3DMsoNormal><span s=
tyle=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><br></span><br><=
br><br><br><span style=3D'font-size:7.5pt;font-family:"Arial","sans-serif";=
color:#5F5F5F'>From: &nbsp; &nbsp; &nbsp; &nbsp;</span><span style=3D'font-=
size:7.5pt;font-family:"Arial","sans-serif"'>&quot;NOEL, ERIC C (ERIC C)&qu=
ot; &lt;<a href=3D"mailto:ecnoel@research.att.com">ecnoel@research.att.com<=
/a>&gt;</span> <br><span style=3D'font-size:7.5pt;font-family:"Arial","sans=
-serif";color:#5F5F5F'>To: &nbsp; &nbsp; &nbsp; &nbsp;</span><span style=3D=
'font-size:7.5pt;font-family:"Arial","sans-serif"'>Janet P Gunn/USA/CSC@CSC=
, &quot;<a href=3D"mailto:sip-overload@ietf.org">sip-overload@ietf.org</a>&=
quot; &lt;<a href=3D"mailto:sip-overload@ietf.org">sip-overload@ietf.org</a=
>&gt;</span> <br><span style=3D'font-size:7.5pt;font-family:"Arial","sans-s=
erif";color:#5F5F5F'>Date: &nbsp; &nbsp; &nbsp; &nbsp;</span><span style=3D=
'font-size:7.5pt;font-family:"Arial","sans-serif"'>05/07/2012 10:01 AM</spa=
n> <br><span style=3D'font-size:7.5pt;font-family:"Arial","sans-serif";colo=
r:#5F5F5F'>Subject: &nbsp; &nbsp; &nbsp; &nbsp;</span><span style=3D'font-s=
ize:7.5pt;font-family:"Arial","sans-serif"'>RE: [sip-overload] comments on =
draft-ietf-soc-overload-rate-control-01</span> <o:p></o:p></p><div class=3D=
MsoNormal align=3Dcenter style=3D'text-align:center'><hr size=3D2 width=3D"=
100%" noshade style=3D'color:#ACA899' align=3Dcenter></div><p class=3DMsoNo=
rmal style=3D'margin-bottom:12.0pt'><br><br><br><span style=3D'font-size:10=
.0pt;font-family:"Calibri","sans-serif";color:#004080'>Janet,</span> <br><s=
pan style=3D'font-size:10.0pt;font-family:"Calibri","sans-serif";color:#004=
080'>&nbsp;</span> <br><span style=3D'font-size:10.0pt;font-family:"Calibri=
","sans-serif";color:#004080'>Thanks for your comments. Please see below ou=
r response.</span> <br><span style=3D'font-size:10.0pt;font-family:"Calibri=
","sans-serif";color:#004080'>&nbsp;</span> <br><span style=3D'font-size:10=
.0pt;font-family:"Calibri","sans-serif";color:#004080'>Thanks,</span> <br><=
span style=3D'font-size:10.0pt;font-family:"Calibri","sans-serif";color:#00=
4080'>&nbsp;</span> <br><span style=3D'font-size:7.5pt;font-family:"Verdana=
","sans-serif";color:#FF8100'>Eric Noel</span><span style=3D'font-size:7.5p=
t;font-family:"Verdana","sans-serif";color:#5F5F5F'> </span><br><b><span st=
yle=3D'font-size:7.5pt;font-family:"Verdana","sans-serif";color:#5F5F5F'>AT=
&amp;T Labs, Inc.</span></b><span style=3D'font-size:7.5pt;font-family:"Ver=
dana","sans-serif";color:#5F5F5F'> </span><i><span style=3D'font-size:7.5pt=
;font-family:"Verdana","sans-serif";color:#00A1E0'><br>Rethink Possible</sp=
an></i> <br><i><span style=3D'font-size:7.5pt;font-family:"Verdana","sans-s=
erif";color:#00A1E0'>&nbsp;</span></i> <br><span style=3D'font-size:7.5pt;f=
ont-family:"Verdana","sans-serif";color:#5F5F5F'>Network Design and Perform=
ance Analysis<br>200 South Laurel Avenue, D5-3D19<br>Middletown, NJ 07748<b=
r>P: 732.420.4174</span> <br><a href=3D"mailto:jsmith@att.com"><span style=
=3D'font-size:7.5pt;font-family:"Verdana","sans-serif"'>ecnoel@att.com</spa=
n></a> <br><span style=3D'font-size:10.0pt;font-family:"Calibri","sans-seri=
f";color:#004080'>&nbsp;</span> <br>&nbsp; <br><span style=3D'font-size:10.=
0pt;font-family:"Arial","sans-serif"'>These are largely editorial comments.=
</span> <br>... <br><span style=3D'font-size:10.0pt;font-family:"Arial","sa=
ns-serif"'><br>Sec 3.4</span> <span style=3D'font-size:10.0pt;font-family:"=
Arial","sans-serif"'><br>...</span> <br><span style=3D'font-size:10.0pt;fon=
t-family:"Calibri","sans-serif";color:#004080'>&nbsp;</span> <br><span styl=
e=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>4th para</span> <sp=
an style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><br>Note tha=
t the target SIP request rate is a max rate that may not be</span> <span st=
yle=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><br>&nbsp; attain=
ed by the arrival rate at the client, and the server cannot</span> <span st=
yle=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><br>&nbsp; assume=
 that it will.</span> <span style=3D'font-size:10.0pt;font-family:"Arial","=
sans-serif"'><br>To</span> <span style=3D'font-size:10.0pt;font-family:"Ari=
al","sans-serif"'><br>Note that the target SIP request rate is an upper bou=
nd on the rate the client may send requests to the server. &nbsp;In many ca=
ses, the client will send messages at a lower rate.</span> <span style=3D'c=
olor:red'><br>&gt; Suggested writing is different than original paragraph m=
eaning. Originally that paragraph stated the server should not assume the a=
rrival rate at client will exceed the server target rate. Your suggested ch=
ange does away with the observation on the arrival rate at client and focus=
es on the arrival rate presented by the client to the server. </span><br><s=
pan style=3D'color:red'>Was that the intent?</span> <br><span style=3D'font=
-size:10.0pt;font-family:"Arial","sans-serif"'><br></span><span style=3D'co=
lor:green'>[JPG] I guess I am confused. &nbsp;Why would the server care wha=
t &nbsp;the arrival rate at the client is? &nbsp;Why would the server assum=
e that the arrival rate at the client ( which may be distributed among many=
 different servers) would, or would not, be bigger that the server target r=
ate?</span> <br><br><span style=3D'font-size:10.0pt;font-family:"Arial","sa=
ns-serif"'><br><br>Janet</span> <br><b><span style=3D'font-size:10.0pt;font=
-family:"Tahoma","sans-serif"'>&nbsp;</span></b> <o:p></o:p></p></div></bod=
y></html>=

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