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From: Andrew Morton <akpm@digeo.com>
To: rwhron@earthlink.net, alan@lxorguk.ukuu.org.uk
Subject: Re: IDE DMA disabled with via82cxxx on kernels >= 2.5.35
Date: Mon, 13 Jan 2003 19:47:08 -0800
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References: <20030114024949.GA165@rushmore>
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On Mon January 13 2003 18:49, rwhron@earthlink.net wrote:
>
> 2.4.20-pre3-jam1:
> 
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  0.70 seconds =182.86 MB/sec
>  Timing buffered disk reads:  64 MB in  2.07 seconds = 30.92 MB/sec
> 
> 2.5.53-mm1
> 
> /dev/hda:
>  Timing buffer-cache reads:   128 MB in  7.20 seconds = 17.78 MB/sec
>  Timing buffered disk reads:  64 MB in 19.66 seconds =  3.26 MB/sec

2.5.53-mm1 had a dud patch in it which made part of the kernel think HZ=100,
other parts think HZ=1000, depending on whether the .c file happened to
include config.h before including param.h.

Hence your nice 10x discrepancy.



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