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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

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