netdev - degradation in network performance upto 20 % in 2.6.18 when compared to 2.6.17

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Message-ID: <9dd3c65d0612290458l2b110341ob31c7212f51efbc8@mail.gmail.com>
Date:	Fri, 29 Dec 2006 18:28:51 +0530
From:	"kalyan tejaswi" <kalyanatejaswi@...il.com>
To:	netdev@...r.kernel.org
Subject: degradation in network performance upto 20 % in 2.6.18 when compared to 2.6.17

 Hi all,
I have been comparing routing and bridging performance tests for
2.6.16,2.6.17,2.6.18,2.6.19 kernels.
The setup is:


       ------------------------
eth0     ------------------------
       |                              |
<---------------------------------->|                                |
       |  Smartbits            |
            |    Malta 4Kc            |
       |                              |
<---------------------------------->|                                |
       ------------------------
eth1     -------------------------


I use D-Link cards for the Malta 4Kc board.
I see that 2.6.18 and 2.6.19 have almost identical performance
figures. Also, same is observed with 2.6.16 and 2.6.17.

But 2.6.16/2.6.17   is roughly 20% better than 2.6.18/2.6.19

Are these results justified? Has anyone observed similar behaviour?
What could be the reason?


Regards
Kalyan
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