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Re: Fwd: How to improve performance of 2.6 kernel

To: kernel coder <>
Subject: Re: Fwd: How to improve performance of 2.6 kernel
From: Ralf Baechle <>
Date: Wed, 19 Oct 2005 16:53:57 +0100
In-reply-to: <>
Original-recipient: rfc822;
References: <> <> <00b201c5d32e$2de780b0$0302a8c0@Ulysses> <> <>
User-agent: Mutt/
On Wed, Oct 19, 2005 at 10:55:01AM +0500, kernel coder wrote:

> I did lmbench benchmarks tests... and the results i got were pretty
> weird.. I am attaching the jpegs :) of the graphs i made in MS Excel.

We're happy with cold, raw ASCII numbers :)

> Btw, I have implemented NAPI in both 2.4.20 and 2.6.10. I ported the
> code to linux-2.6 in order to increase the board's efficiency but I'm
> quite dissapointed with the results so far :(.

NAPI is doing it's job which is keeping a system responsive under extreme
loads very well.  The pre-NAPI behaviour was simply locking up thus making
systems easily DOS-able.  NAPI is not meant to improve latency; it isn't
meant but frequently mistaken to.


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