netdev - Re: Network latency regressions from 2.6.22 to 2.6.29 (MSI off)

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Message-ID: <alpine.DEB.1.10.0904211526580.5597@qirst.com>
Date:	Tue, 21 Apr 2009 15:36:32 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	David Miller <davem@...emloft.net>,
	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 (MSI off)


Switching off MSI increases the latency another step:


MSI off
UDP ping pong 40 bytes	Test 1	Test 2	Test 3	Test 4
2.6.27		91.1725	91.31	91.17	91.12	91.09
2.6.28		91.5625	91.71	91.45	91.67	91.42
2.6.29		91.7	91.71	91.67	91.72	91.7
2.6.30-rc2	91.835	91.83	91.78	91.82	91.91

MSI on

UDP ping pong 40 bytes	Test 1	Test 2	Test 3	Test 4
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

Next test series will have always the same kernel on one side etc.


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