From owner-freebsd-current Sat Jun 5 14:37:13 1999 Delivered-To: freebsd-current@freebsd.org Received: from bantu.cl.msu.edu (bantu.cl.msu.edu [35.8.3.18]) by hub.freebsd.org (Postfix) with ESMTP id 0BCB414F37 for ; Sat, 5 Jun 1999 14:36:22 -0700 (PDT) (envelope-from dervish@bantu.cl.msu.edu) Received: (from dervish@localhost) by bantu.cl.msu.edu (8.9.3/8.9.3) id RAA09370; Sat, 5 Jun 1999 17:32:20 -0400 (EDT) (envelope-from dervish) Date: Sat, 5 Jun 1999 17:32:20 -0400 From: bush doctor To: "Daniel J. O'Connor" Cc: freebsd-current@freebsd.org Subject: Re: What is MTRR all about??? Message-ID: <19990605173220.A8620@bantu.cl.msu.edu> References: <19990604111316.A2066@bantu.cl.msu.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.4i In-Reply-To: ; from Daniel J. O'Connor on Sat, Jun 05, 1999 at 02:05:51AM +0930 X-Operating-System: FreeBSD 4.0-CURRENT i386 X-PGP-Fingerprint: 35 95 F8 63 DA 5B 32 51 8F A9 AC 3C B4 74 F3 BA WWW-Home-Page: http://www.msu.edu/~ikhala Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Quoting Daniel J. O'Connor (darius@dons.net.au): > > On 04-Jun-99 bush doctor wrote: > > Pentium Pro MTRR support enabled, default memory type is uncacheable > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > What is MTRR? Using the web based cross referencing tool I came up with > > MTRR's are a way to tell the processor how to cache regions of memory. Its > commonly used to speed up video card access by disabling caching on the linear > frame buffer, this makes writes to the card faster (around 0-30%). The penalty > is that reading is slower, but since that doesn't happen very often the speed > increase is good. > > Try man memcontrol - It doesn't yet work on SMP boxes though. Hmmm ... bantu.cl.msu.edu:dervish> more /usr/src/usr.sbin/memcontrol/Makefile PROG= memcontrol NOMAN= yes .include No man page yet. No horrors tho'. Man pages and info files are great, but there's nothing like reading through the sources ... #;^) > > --- > Daniel O'Connor software and network engineer > for Genesis Software - http://www.gsoft.com.au > "The nice thing about standards is that there > are so many of them to choose from." > -- Andrew Tanenbaum > #;^) -- So ya want ta here da roots? Dem that feels it knows it ... bush doctor To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message