Date: Sat, 5 Jun 1999 17:32:20 -0400 From: bush doctor <dervish@bantu.cl.msu.edu> To: "Daniel J. O'Connor" <darius@dons.net.au> Cc: freebsd-current@freebsd.org Subject: Re: What is MTRR all about??? Message-ID: <19990605173220.A8620@bantu.cl.msu.edu> In-Reply-To: <XFMail.990605020551.darius@dons.net.au>; from Daniel J. O'Connor on Sat, Jun 05, 1999 at 02:05:51AM %2B0930 References: <19990604111316.A2066@bantu.cl.msu.edu> <XFMail.990605020551.darius@dons.net.au>
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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 <bsd.prog.mk> 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 <dervish@bantu.cl.msu.edu> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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