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    SubjectRe: [PATCH 09/14] msm: iommu: Kconfig option for cacheable page tables
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    On Fri, 2010-11-12 at 19:29 -0800, Stepan Moskovchenko wrote:
    >
    > +config IOMMU_PGTABLES_L2
    > + depends on ARCH_MSM8X60
    > + depends on MMU
    > + depends on CPU_DCACHE_DISABLE=n
    > + depends on SMP
    > + bool "Cacheable IOMMU page tables"
    > + default y
    > + help
    > + Allows the IOMMU page tables to be brought into the L2 cache. This
    > + improves the TLB miss latency at the expense of potential pollution
    > + of the L2 cache. This option has been shown to improve multimedia
    > + performance in some cases.
    > +
    > + If unsure, say Y here.

    Why would someone want this off?

    The other thing is that you usually want this included with the code
    that uses the option.

    Daniel

    --
    Sent by an consultant of the Qualcomm Innovation Center, Inc.
    The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
    Forum.




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