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Re: Fwd: How to improve performance of 2.6 kernel

To: "Mitchell, Earl" <>
Subject: Re: Fwd: How to improve performance of 2.6 kernel
From: Ralf Baechle <>
Date: Thu, 20 Oct 2005 10:36:41 +0100
Cc: kernel coder <>,
In-reply-to: <3CB54817FDF733459B230DD27C690CEC01049446@Exchange.MIPS.COM>
Original-recipient: rfc822;
References: <3CB54817FDF733459B230DD27C690CEC01049446@Exchange.MIPS.COM>
User-agent: Mutt/
On Wed, Oct 19, 2005 at 11:12:22AM -0700, Mitchell, Earl wrote:

> If you are looking at network performance ...
> A while back I briefly looked at this and it
> looked like the per packet processing time had
> gone up significantly between 2.4.20 and
> 2.6.x. Problem was not NAPI which switches
> from interrupt to polling mode when you get a burst 
> of packets. I actually traced a single packet from Rx 
> to Tx. Unfortunately I didn't save my data and did 
> not isolate where increased time was being spent. 

A common cause for low networking performance is connection tracking.  Just
loading the module will have serious impact.


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