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    SubjectRe: [PATCH] x86: mtrr cleanup for converting continuous to discrete layout v5
    On Mon, Apr 28, 2008 at 3:36 PM, Randy Dunlap <randy.dunlap@oracle.com> wrote:
    > 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"

    thanks.

    YH


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