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From: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
Reply-To: vda@port.imtp.ilyichevsk.odessa.ua
To: Jens Axboe <axboe@suse.de>, Brian Gerst <bgerst@didntduck.org>
Subject: Re: Machine's high load when HIGHMEM is enabled
Date: Sun, 3 Nov 2002 22:43:08 -0200
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Cc: vasya vasyaev <vasya197@yahoo.com>, linux-kernel@vger.kernel.org
References: <20021103141753.50480.qmail@web20503.mail.yahoo.com> <3DC5337C.4090506@quark.didntduck.org> <20021103150041.GM807@suse.de>
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On 3 November 2002 13:00, Jens Axboe wrote:
> On Sun, Nov 03 2002, Brian Gerst wrote:
> > vasya vasyaev wrote:
> > >Hello,
> > >
> > >I have some strange kind of problem:
> > >When HIGHMEM-enabled kernel is used, there is too high
> > >CPU load on any task - computer get loaded high while
> > >it is doing some minor, usual jobs (load average grows
> > >significantly).
> >
> > 2.4 can only do I/O to and from lowmem.  This means highmem pages
> > have
>
> 2.4.19 and below, 2.4.20-pre/rc can dma to/from highmem pages just
> fine.
>
> > to use bounce buffers in lowmem, and th edata is copied to/from
> > highmem which is causing the cpu load.  This has been corrected in
> > 2.5, which can do I/O to any page the device can DMA from.
>
> I seriously doubt this is his problem, sounds like something else.
> For gzip to be disk bound (and thus bounce bound) you would need a
> seriously fast cpu. And the ssh problem cannot be explained by
> bouncing either.

bad mtrr?
--
vda
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