Date: Sat, 05 Jun 1999 02:05:51 +0930 (CST) From: "Daniel J. O'Connor" <darius@dons.net.au> To: bush doctor <dervish@bantu.cl.msu.edu> Cc: current@freebsd.org Subject: RE: What is MTRR all about??? Message-ID: <XFMail.990605020551.darius@dons.net.au> In-Reply-To: <19990604111316.A2066@bantu.cl.msu.edu>
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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. --- 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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