From: Andrew Morton <akpm@digeo.com>
To: rwhron@earthlink.net, alan@lxorguk.ukuu.org.uk
Cc: linux-kernel@vger.kernel.org
Subject: Re: IDE DMA disabled with via82cxxx on kernels >= 2.5.35
Date: Mon, 13 Jan 2003 19:47:08 -0800 [thread overview]
Message-ID: <200301131947.08610.akpm@digeo.com> (raw)
In-Reply-To: <20030114024949.GA165@rushmore>
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.
next prev parent reply other threads:[~2003-01-14 3:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-14 2:49 IDE DMA disabled with via82cxxx on kernels >= 2.5.35 rwhron
2003-01-14 3:47 ` Andrew Morton [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-01-08 5:16 rwhron
2003-01-08 14:02 ` Alan Cox
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