[ofa-general] IPoIB-CM/RC - NAPI patch.

[Bernard King-Smith]

> ----- Message from "Erez Strauss" <erezs at voltaire.com> on Tue, 6 Mar
> 2007 00:07:41 +0200 -----
> 
> To:
> 
> <openib-general at lists.openfabrics.org>
> 
> Subject:
> 
> [ofa-general] IPoIB-CM/RC - NAPI patch.
> 
> Hello Roland,
> 
> I understand that you have a patch to enable NAPI for IPoIB-CM/RC.
> 
> I?m interested in the patch to reduce the number of interrupts I get
> on a system (40k /s).

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.

> 
> Does it apply to the nightly build?
> 
> Are there tunable variables to control the increase of latency due 
> to reduction of interrupts?
> 
> Would you please send me a copy?
> 
> Thanks,
> Erez
> Voltaire Inc.



Bernie King-Smith 
IBM Corporation
Server Group
Cluster System Performance 
wombat2 at us.ibm.com    (845)433-8483
Tie. 293-8483 or wombat2 on NOTES 

"We are not responsible for the world we are born into, only for the world 
we leave when we die.
So we have to accept what has gone before us and work to change the only 
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-- The Future." William Shatner
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