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Re: What Does "kernel mtrr" mean...

To: David Lloyd <lloy0076@xxxxxxxxxxxx>
Subject: Re: What Does "kernel mtrr" mean...
From: Paul Jackson <pj@xxxxxxxxxxxx>
Date: Tue, 30 Jul 2002 13:24:54 -0700 (PDT)
Cc: linux-xfs@xxxxxxxxxxx
In-reply-to: <3D465381.69437169@rebel.net.au>
Sender: owner-linux-xfs@xxxxxxxxxxx
You can find some background on "mtrr" in the linux file
Documentation/mtrr.txt, which begins:

    MTRR (Memory Type Range Register) control
    3 Jun 1999
    Richard Gooch

      On Intel P6 family processors (Pentium Pro, Pentium II and later)
      the Memory Type Range Registers (MTRRs) may be used to control
      processor access to memory ranges. This is most useful when you have
      a video (VGA) card on a PCI or AGP bus. Enabling write-combining
      allows bus write transfers to be combined into a larger transfer
      before bursting over the PCI/AGP bus. This can increase performance
      of image write operations 2.5 times or more.

                          I won't rest till it's the best ...
                          Programmer, Linux Scalability
                          Paul Jackson <pj@xxxxxxx> 1.650.933.1373

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