From: David Wragg <dpw@doc.ic.ac.uk>
To: robert@mpe.mpg.de
Cc: linux-kernel@vger.kernel.org
Subject: Re: Solved with MTRR was: ISSUE: very slow (factor 100) 4-way 16GByte server, with 2.4.2
Date: 29 Mar 2001 15:50:09 +0000 [thread overview]
Message-ID: <y7r1yrgy3pq.fsf@sytry.doc.ic.ac.uk> (raw)
In-Reply-To: <200103291534.f2TFYr700338@robert2.mpe-garching.mpg.de>
In-Reply-To: Robert Suetterlin's message of "Thu, 29 Mar 2001 17:34:53 +0200"
Robert Suetterlin <sutter@robert2.mpe-garching.mpg.de> writes:
> 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.
/proc/mtrr does allow overlapping regions in some cases, but the
conditions turned out to be stricter than I remembered. You have to
create the enclosing range first, which makes the facility useless in
this case (perhaps in all potentially useful cases).
> So what I do is only disable 3-7, and then
> base=0x400000000 size=0x400000000.
Yes, that solution should be safe.
prev parent reply other threads:[~2001-03-29 15:51 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 ` Solved with MTRR " Robert Suetterlin
2001-03-29 15:50 ` David Wragg [this message]
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