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Date: Mon, 22 Oct 2001 14:09:35 +0200
From: Andrea Arcangeli <andrea@suse.de>
To: linux-kernel@vger.kernel.org
Subject: Re: problems with I/O performance with 2.4.12-ac3
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In-Reply-To: <20011019195328.A30781@localhost>; from vdb@mail.ru on Fri, Oct 19, 2001 at 07:53:28PM +0400
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On Fri, Oct 19, 2001 at 07:53:28PM +0400, Dmitry Volkoff wrote:
> Hi,
> On my machine HDD is slow with all ac-kernels I've tried so far.
> There is even more simple test -- hdparm.
> 
> 2.4.12-ac3:
> # hdparm -tT /dev/hda
> /dev/hda:
> Timing buffer-cache reads:   128 MB in  0.70 seconds =182.86 MB/sec
> Timing buffered disk reads:  64 MB in  2.88 seconds = 22.22 MB/sec
> 
> 2.4.13-pre3:
> # hdparm -tT /dev/hda
> /dev/hda
> Timing buffer-cache reads:   128 MB in  0.63 seconds =203.00 MB/sec
> Timing buffered disk reads:  64 MB in  1.57 seconds = 40.76 MB/sec

this should be mostly the blkdev in pagecache and possibly also the vm.

Andrea
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