netdev - Re: Network latency regressions from 2.6.22 to 2.6.29 (results with IRQ affinity)

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Message-ID: <alpine.DEB.1.10.0904171238550.20049@qirst.com>
Date:	Fri, 17 Apr 2009 12:42:40 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	David Miller <davem@...emloft.net>
cc:	dada1@...mosbay.com, Michael Chan <mchan@...adcom.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	netdev@...r.kernel.org
Subject: Re: Network latency regressions from 2.6.22 to 2.6.29 (results with
 IRQ affinity)

On Thu, 16 Apr 2009, David Miller wrote:

> We really need to find a good way to fix that IRQ affinity issue.

Here are the results with setting interrupt affinity. We are still loosing
5 usecs from .22 to .30-rc2. We will investigate more in depth time
permitting.

	UDP ping pong 40 bytes

Kernel		Test 1	Test 2	Test 3	Test 4	Avg
2.6.22		83.1125	83.4	83.03	82.95	83.07
2.6.23		83.33	83.51	83.18	83.42	83.21
2.6.24		82.7775	82.8	82.77	82.77	82.77
2.6.25		85.875	85.94	85.75	86.06	85.75
2.6.26		87.4025	87.53	87.25	87.3	87.53
2.6.27		87.81	87.81	87.77	87.82	87.84
2.6.28		87.4275	87.77	87.24	87.28	87.42
2.6.29		88.4325	88.48	88.42	88.44	88.39
2.6.30-rc2	88.4925	88.49	88.44	88.56	88.48
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