netdev - Re: udp ping pong measurements from 2.6.22 to .30 with various cpu affinities

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Date:	Fri, 24 Apr 2009 10:23:45 -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: udp ping pong measurements from 2.6.22 to .30 with various cpu
 affinities

Sorry for the late response but somehow it got stuck.

On Thu, 23 Apr 2009, Eric Dumazet wrote:

> For example, "cat /proc/cpuinfo", just to be sure you did not invert cpus,
> since your results are not that logical.

We confirmed that there is an issue with processors (32/64 bit
different was surprising).... Rerunning tests to have the proper l2 cache
sharing.

> "size vmlinux-2.6.2[2-9] vmlinux-2.6.30" to check how kernel text size increase.
> We add new features, security knobs, fixes, ... and this probably increase number
> of instructions taken in a particular workload, who knows ?

-rw-r--r-- 1 root   root    2770952 2009-04-02 14:40 vmlinuz-2.6.22
-rw-r--r-- 1 root   root    2681816 2009-04-06 18:44 vmlinuz-2.6.23
-rw-r--r-- 1 root   root    2314872 2009-04-06 18:46 vmlinuz-2.6.24
-rw-r--r-- 1 root   root    2358584 2009-04-06 18:48 vmlinuz-2.6.25
-rw-r--r-- 1 root   root    2392144 2009-04-06 18:49 vmlinuz-2.6.26
-rw-r--r-- 1 root   root    2438656 2009-04-06 18:52 vmlinuz-2.6.27
-rw-r--r-- 1 root   root    2518400 2009-04-06 18:53 vmlinuz-2.6.28
-rw-r--r-- 1 root   root    2553024 2009-04-06 18:55 vmlinuz-2.6.29
-rw-r--r-- 1 root   root    2579392 2009-04-16 11:19 vmlinuz-2.6.30-rc2

> What was the size of packets used on this last test ?

40 bytes
>
> iptables active or not ? conntrack ?

no conntrack not iptables.

> Using NO_HZ mode gives higher latencies

CONFIG_NO_HZ is set

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