linux-kernel - Re: increased number of cycles

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Message-ID: <47404EA1.5010902@rtr.ca>
Date:	Sun, 18 Nov 2007 09:39:29 -0500
From:	Mark Lord <lkml@....ca>
To:	kernel coder <lhrkernelcoder@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: increased number of cycles

kernel coder wrote:
> hi,
>         I'm trying to add some code to netif_receive_skb function in
> dev.c file . The cycles consumed by that code was around 16 cycles on
> Dual Core Opetron machine.I'm working on that code for last 6 months
> now and the consumed cycles have always been around 16 cycles .I don't
> touch any other part of kernel .
> 
> But for last 4 days the consumed cycles have suddenly increased to
> around 35 cycles . I'm using RDTSC instruction to profile the
> code.There is no change in code and the kernel version is also the
> same .I am assuming that there  must be something wrong with hardware.
..

A cache miss ?
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