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Re: >10% performance degradation since 2.6.18

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From: Herbert Xu <herbert@...>
To: Matthew Wilcox <matthew@...>
Cc: Jeff Garzik <jeff@...>, <andi@...>, <arjan@...>, <jens.axboe@...>, <linux-kernel@...>, <douglas.w.styner@...>, <chinang.ma@...>, <terry.o.prickett@...>, <matthew.r.wilcox@...>, <netdev@...>, Jesse Brandeburg <jesse.brandeburg@...>
Subject: Re: &gt;10% performance degradation since 2.6.18
Date: Sunday, July 5, 2009 - 12:11 pm

On Sun, Jul 05, 2009 at 07:09:26AM -0600, Matthew Wilcox wrote:

Not reliably.  You can tweak the hash in the NIC to redirect
traffic (aka flow director) but ultimately if you've got more
sockets than queues then it's a losing game.

A better strategy for now is to pin everything down and try to
get user-space involved by using threads and distributing the
sockets based on which queue they're associated with.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
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Messages in current thread:
Re: &gt;10% performance degradation since 2.6.18, Jeff Garzik, (Sat Jul 4, 5:19 am)
Re: &gt;10% performance degradation since 2.6.18, Herbert Xu, (Sun Jul 5, 12:01 am)
Re: &gt;10% performance degradation since 2.6.18, Rick Jones, (Mon Jul 6, 1:00 pm)
RE: &gt;10% performance degradation since 2.6.18, Ma, Chinang, (Mon Jul 6, 1:36 pm)
Re: &gt;10% performance degradation since 2.6.18, Matthew Wilcox, (Mon Jul 6, 1:42 pm)
RE: &gt;10% performance degradation since 2.6.18, Ma, Chinang, (Mon Jul 6, 1:57 pm)
Re: &gt;10% performance degradation since 2.6.18, Matthew Wilcox, (Mon Jul 6, 2:05 pm)
RE: &gt;10% performance degradation since 2.6.18, Ma, Chinang, (Mon Jul 6, 2:48 pm)
Re: &gt;10% performance degradation since 2.6.18, Matthew Wilcox, (Mon Jul 6, 2:53 pm)
Re: &gt;10% performance degradation since 2.6.18, Jeff Garzik, (Sun Jul 5, 4:44 pm)
Re: &gt;10% performance degradation since 2.6.18, Andi Kleen, (Mon Jul 6, 4:45 am)
Re: &gt;10% performance degradation since 2.6.18, Herbert Xu, (Sun Jul 5, 9:19 pm)
Re: &gt;10% performance degradation since 2.6.18, Matthew Wilcox, (Sun Jul 5, 9:09 am)
Re: &gt;10% performance degradation since 2.6.18, Andi Kleen, (Mon Jul 6, 4:38 am)
Re: >10% performance degradation since 2.6.18, Herbert Xu, (Sun Jul 5, 12:11 pm)