netdev - Re: degradation in bridging performance of 5% in 2.6.20 when compared to 2.6.19

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Date:	Fri, 16 Feb 2007 09:43:20 -0800
From:	Rick Jones <rick.jones2@...com>
To:	kalyan tejaswi <kalyanatejaswi@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: degradation in bridging performance of 5% in 2.6.20 when compared
 to	2.6.19

kalyan tejaswi wrote:
> Hi all,
> I have been comparing bridging performance for 2.6.20 and 2.6.19
> kernels. The kenel configurations are identical for both the kernels.
> I use D-Link cards (8139too driver) for the Malta 4Kc board.
> 
> The setup is:
> 
> netperf  client  <------->  malta 4Kc  <---------> netperf  server.
> 
> The throughput statistics (in 10^6 bits/second) are:
> 
>                    2.6.19          2.6.20
> routing            30.2           30.16
> bridging          32.35          30.81
> 
> I observe that there has been a degradation in bridging performance of
> 5% in 2.6.20 when compared to 2.6.19.
> 
> Has anyone observed similar behaviour?
> Any inputs or suggestions are welcome.

In each case is the malta CPU bound?  If not, some idea of the change in 
CPU util might be helpful.

rick jones
btw, netperf 2.4.3 just released:
ftp://ftp.netperf.org/netperf
http://www.netperf.org/svn/netperf2/tags/netperf-2.4.3
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