netdev - Network latency regressions from 2.6.22 to 2.6.29

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Date:	Thu, 16 Apr 2009 12:10:01 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	netdev@...r.kernel.org
Subject: Network latency regressions from 2.6.22 to 2.6.29

The following are results of lantency measurements using udpping
(available from http://gentwo.org/ll). It shows that significant latencies
were added since 2.6.27. I surely wish we could get back to times below 90
microseconds.

The tests were done over 1G ethernet using
09:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5754
Gigabit Ethernet PCI Express (rev 02)

Results:

           2.6.22 2.6.23 2.6.24 2.6.25 2.6.26 2.6.27 2.6.28 2.6.29
40 Bytes    89.50  90.75  89.61  91.51  91.89  99.17  99.80  99.34
400 Bytes   98.58 101.44  97.85  99.61 100.36 117.96 118.10 126.79
1400 Bytes 152.76 153.75 153.85	156.22 156.66 163.92 165.54 166.04

Compared to 2.6.22 2.6.23 2.6.24 2.6.25 2.6.26 2.6.27 2.6.28 2.6.29
40 Bytes            -1.4%  -0.1%  -2.2%  -2.6%  -9.8%  -10.3% -9.9%
400 Bytes           -2.8%   0.7%  -1.0%  -1.8% -16.4%  -16.5%-22.2%
1400 Bytes          -0.6%  -0.7%  -2.2%  -2.5%  -6.8%  -7.7%  -8.0%

I presented these numbers with some nice graphs at the Linux Collab Summit
last week.

See
http://www.kernel.org/pub/linux/kernel/people/christoph/collab-spring-2009/Collab-summit-2009-sf.pdf

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