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From: Robert Suetterlin <sutter@robert2.mpe-garching.mpg.de>
To: David Wragg <dpw@doc.ic.ac.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Solved with MTRR was: ISSUE: very slow (factor 100) 4-way 16GByte server, with 2.4.2
Date: Thu, 29 Mar 2001 17:34:53 +0200	[thread overview]
Message-ID: <200103291534.f2TFYr700338@robert2.mpe-garching.mpg.de> (raw)
In-Reply-To: Your message of "29 Mar 2001 00:07:17 -0000." <y7rk859780a.fsf@sytry.doc.ic.ac.uk>

Thanks everyone,

	especially David, for explaining the MTRR problem to me in detail.

I could get the machine to work nicely by mapping all memory in MTRRs.

There are only two corrections I would like to make to Davids eMail:
> # cat >/proc/mtrr
> disable=2
> disable=3
> disable=4
> disable=5
> disable=6
> disable=7
> base=0 size=0x400000000 type=write-back
> base=0x400000000 size=0x4000000 type=write-back
> base=0x404000000 size=0x1000000 type=write-back
> ^D

1. it is cat >| /proc/mtrr
2. I was not allowed to do `base=0 size=0x400000000 type=write-back`, because of the overlap with the memory range at base=0x0fb000000.  So what I do is only disable 3-7, and then base=0x400000000 size=0x400000000.


Thanks alot,

	Robert S.

  reply	other threads:[~2001-03-29 15:35 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <Pine.LNX.4.21.0103281052510.8261-100000@imladris.rielhome.conectiva>
2001-03-29  0:07 ` Not MTRR !? " David Wragg
2001-03-29 15:34   ` Robert Suetterlin [this message]
2001-03-29 15:50     ` Solved with MTRR " David Wragg

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