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    SubjectRe: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v5
    On Mon, 28 Apr 2008 15:05:05 -0700 Yinghai Lu wrote:

    > Index: linux-2.6/Documentation/kernel-parameters.txt
    > ===================================================================
    > --- linux-2.6.orig/Documentation/kernel-parameters.txt
    > +++ linux-2.6/Documentation/kernel-parameters.txt
    > @@ -595,6 +595,16 @@ and is between 256 and 4096 characters.
    > See drivers/char/README.epca and
    > Documentation/digiepca.txt.
    >
    > + disable_mtrr_cleanup [X86]
    > + enable_mtrr_cleanup [X86]
    > + The kernel try to adjust MTRR layout from continuous

    tries

    > + to discrete, to make x server driver could add WB entry

    X server driver able to add WB entry

    > + later. This parameter enable/disable that.

    enables/disables

    > +
    > + mtrr_chunk_size=nn[KMG] [X86]
    > + used for mtrr cleanup. It is largest continous chunk
    > + that could hold holes aka. UC entries.
    > +
    > disable_mtrr_trim [X86, Intel and AMD only]
    > By default the kernel will trim any uncacheable
    > memory out of your available memory pool based on
    > Index: linux-2.6/arch/x86/Kconfig
    > ===================================================================
    > --- linux-2.6.orig/arch/x86/Kconfig
    > +++ linux-2.6/arch/x86/Kconfig
    > @@ -1035,6 +1035,32 @@ config MTRR
    >
    > See <file:Documentation/mtrr.txt> for more information.
    >
    > +config MTRR_SANITIZER
    > + def_bool y
    > + prompt "MTRR cleanup support"
    > + depends on MTRR
    > + help
    > + Convert MTRR layout from continuous to discrete, so some X driver
    > + could add WB entries.
    > +
    > + Say N here if you see bootup problems (boot crash, boot hang,
    > + spontaneous reboots).
    > +
    > + could be disabled with disable_mtrr_cleanup. also mtrr_chunk_size

    Could Also

    > + could be used to send largest mtrr entry size for continuous block
    > + to hold holes (aka. UC entries)
    > +
    > + If unsure, say Y.
    > +
    > +config MTRR_SANITIZER_ENABLE_DEFAULT
    > + bool
    > + prompt "MTRR cleanup enable default"

    prompt "Enable MTRR cleanup"
    or
    prompt "Enable MTRR cleanup by default"

    > + depends on MTRR_SANITIZER
    > + help
    > + Enable mtrr cleanup by default

    default.

    > +
    > + If unsure, say Y.
    > +
    > config X86_PAT
    > bool
    > prompt "x86 PAT support"

    ---
    ~Randy


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