netdev - 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 11:56:29 +0530
From:	"kalyan tejaswi" <kalyanatejaswi@...il.com>
To:	netdev@...r.kernel.org
Subject: degradation in bridging performance of 5% in 2.6.20 when compared to 2.6.19

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.

Regards
Kalyan
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