RE: Machine's high load when HIGHMEM is enabled

Nakajima, Jun
2002-11-04T19:42:55Z

Also try to disable BIOS remapping in the BIOS setup menu, if any. I know
some BIOS that forgot to reset the proper memory attribute in the MTRR(s)
after the remapping.

Jun

> -----Original Message-----
> From: Andrew Morton [mailto:akpm@digeo.com]
> Sent: Monday, November 04, 2002 11:28 AM
> To: vasya vasyaev
> Cc: linux-kernel@vger.kernel.org
> Subject: Re: Machine's high load when HIGHMEM is enabled
>
> 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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