Re: severe performance degradation on serverworks with high mem

From: Eric W. Biederman (ebiederm@xmission.com)
Date: Fri Oct 19 2001 - 02:24:09 EST


"Brian C. Thomas" <bcthomas@nature.Berkeley.edu> writes:

> Hi
>
> I don't know if this helps, but I seem to have stumbled onto a
> possible "fix" for this...
>
> With 64GB high memory enabled in kernel 2.4.12-ac3, and mtrr turned
> on, I was able to see all 8GB RAM on my machine by using the old
> 'append="mem=8000M"' command in my lilo.conf file... AND WITH NO LOSS
> OF PERFORMANCE!
>
> Does that help anyone with defining where this problem is coming from?

cat /proc/mtrr and see what the mtrrs look like. It feels like there you
have a spot of RAM the BIOS doesn't cover with mtrrs.

Eric
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