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Date: Mon, 04 Nov 2002 11:27:52 -0800
From: Andrew Morton <akpm@digeo.com>
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To: vasya vasyaev <vasya197@yahoo.com>
CC: linux-kernel@vger.kernel.org
Subject: Re: Machine's high load when HIGHMEM is enabled
References: <3DC5337C.4090506@quark.didntduck.org> <20021104185435.11019.qmail@web20504.mail.yahoo.com>
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vasya vasyaev wrote:
> 
> Hello,
> 
> First of all - thanks to these people, who responded
> to my question.
> 
> I have some news...
> 
> I've tried kernels:
> 2.4.19 - the same result
> 2.5.44 - the same result
> 2.5.45 - the same result
> 
> If I take 1 Gb of memory away, then computer works
> much better, faster (something like without enabled
> HIGHMEM at all).
> The same effect takes place if I say mem=1024M while
> physically box has 2Gb of RAM - everything is fine!
> But if I start HIGHMEM enabled kernel on this box (2Gb
> RAM), then it works too slowly...
> 

Please ensure that the mtrr driver is enabled in kernel config,
boot with mem=2G and send the output of `cat /proc/mtrr'.

Also, `dmesg | head -120' would be interesting.
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