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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Bernie,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thank you for your reply.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>In this case I’m using an
application which is using very small messages (300Bytes) and I can not change
it.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The focus of the testing is to reduce the
latency to minimum during high stress, while keeping the application intact.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Similar synthetic test would be multiple ‘iperf
–l 300 ….’ and sum of the total bandwidth (or packets per
seconds).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Any suggestions for IPoIB-CM/RC are
welcome.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Do you expect the SDP to perform better
under the above constrains?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Erez<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Voltaire Inc.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<hr size=2 width="100%" align=center tabindex=-1>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
general-bounces@lists.openfabrics.org
[mailto:general-bounces@lists.openfabrics.org] <b><span style='font-weight:
bold'>On Behalf Of </span></b>Bernard King-Smith<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, March 05, 2007 6:27
PM<br>
<b><span style='font-weight:bold'>To:</span></b> general@lists.openfabrics.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [ofa-general]
IPoIB-CM/RC - NAPI patch.</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><br>
</span></font><font size=2 face="Courier New"><span style='font-size:10.0pt;
font-family:"Courier New"'><br>
<tt><font face="Courier New">> ----- Message from "Erez Strauss"
<erezs@voltaire.com> on Tue, 6 Mar</font></tt><br>
<tt><font face="Courier New">> 2007 00:07:41 +0200 -----</font></tt></span></font>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt><font face="Courier New">> To:</font></tt></span></font> <br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt><font face="Courier New">> <openib-general@lists.openfabrics.org></font></tt></span></font>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt><font face="Courier New">> Subject:</font></tt></span></font> <br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt><font face="Courier New">> [ofa-general] IPoIB-CM/RC - NAPI patch.</font></tt></span></font>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt><font face="Courier New">> Hello Roland,</font></tt></span></font> <br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> I
understand that you have a patch to enable NAPI for IPoIB-CM/RC.</span></font></tt>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>>
I’m interested in the patch to reduce the number of interrupts I get</span></font></tt><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt><font face="Courier New">> on a system (40k /s).</font></tt></span></font>
<br>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>Are you
still getting 40k interrupts per second with IPoIB-CM? You shouldn't because if
you are using a 32768 MTU size you should cut the interrupts down by a factor
of 16. With IPoIB-CM, each interrupt should be a 32K message instead of a 2K
message.</span></font></tt> <br>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> Does it
apply to the nightly build?</span></font></tt> <br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> Are
there tunable variables to control the increase of latency due </span></font></tt><font
size=2 face="Courier New"><span style='font-size:10.0pt;font-family:"Courier New"'><br>
<tt><font face="Courier New">> to reduction of interrupts?</font></tt></span></font>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> Would
you please send me a copy?</span></font></tt> <br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> </span></font></tt>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> Thanks,</span></font></tt>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>> Erez</span></font></tt>
<br>
<tt><font size=2 face="Courier New"><span style='font-size:10.0pt'>>
Voltaire Inc.</span></font></tt><font size=2 face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New"'><br>
</span></font><br>
<br>
<font size=2 face=sans-serif><span style='font-size:10.0pt;font-family:sans-serif'><br>
Bernie King-Smith <br>
IBM Corporation<br>
Server Group<br>
Cluster System Performance <br>
wombat2@us.ibm.com (845)433-8483<br>
Tie. 293-8483 or wombat2 on NOTES <br>
<br>
"We are not responsible for the world we are born into, only for the world
we leave when we die.<br>
So we have to accept what has gone before us and work to change the only thing
we can,<br>
-- The Future." William Shatner</span></font><o:p></o:p></p>
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