From: Daniel Walker <dwalker@codeaurora.org>
To: Stepan Moskovchenko <stepanm@codeaurora.org>
Cc: davidb@codeaurora.org, bryanh@codeaurora.org,
linux-arm-msm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 09/14] msm: iommu: Kconfig option for cacheable page tables
Date: Sun, 14 Nov 2010 12:17:38 -0800 [thread overview]
Message-ID: <1289765858.24270.240.camel@m0nster> (raw)
In-Reply-To: <1289619000-13167-10-git-send-email-stepanm@codeaurora.org>
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.
WARNING: multiple messages have this Message-ID (diff)
From: dwalker@codeaurora.org (Daniel Walker)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 09/14] msm: iommu: Kconfig option for cacheable page tables
Date: Sun, 14 Nov 2010 12:17:38 -0800 [thread overview]
Message-ID: <1289765858.24270.240.camel@m0nster> (raw)
In-Reply-To: <1289619000-13167-10-git-send-email-stepanm@codeaurora.org>
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.
next prev parent reply other threads:[~2010-11-14 20:17 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-13 3:29 [PATCH 00/14] Improvements to the MSM IOMMU driver Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 01/14] msm: iommu: Increase maximum MID size to 5 bits Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 02/14] msm: iomap: Addresses and IRQs for 2nd GFX core IOMMU Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 03/14] msm: iommu: Use more consistent naming in platform data Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 04/14] msm: iommu: Revise GFX3D IOMMU contexts and M2V mappings Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 05/14] msm: iommu: Revise GFX2D0 " Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 06/14] msm: iommu: Support for the 2nd GFX core's IOMMU Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 07/14] msm: iommu: Mark functions with the right section names Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 08/14] msm: iommu: Don't flush page tables if no devices attached Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 09/14] msm: iommu: Kconfig option for cacheable page tables Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-14 20:17 ` Daniel Walker [this message]
2010-11-14 20:17 ` Daniel Walker
2010-11-15 2:56 ` Stepan Moskovchenko
2010-11-15 2:56 ` Stepan Moskovchenko
2010-11-15 2:56 ` Stepan Moskovchenko
2010-11-15 18:20 ` Daniel Walker
2010-11-15 18:20 ` Daniel Walker
2010-11-15 18:20 ` Daniel Walker
2010-11-16 1:47 ` Stepan Moskovchenko
2010-11-16 1:47 ` Stepan Moskovchenko
2010-11-16 1:47 ` Stepan Moskovchenko
2010-11-16 1:46 ` [PATCH 09/14 v2] msm: iommu: Kconfig item " Stepan Moskovchenko
2010-11-16 1:46 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 10/14] msm: iommu: Check if device is already attached Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 11/14] msm: iommu: Kconfig dependency for the IOMMU API Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 12/14] msm: iommu: Definitions for extended memory attributes Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-16 2:19 ` [PATCH 12/14 v2] " Stepan Moskovchenko
2010-11-16 2:19 ` Stepan Moskovchenko
2010-11-13 3:29 ` [PATCH 13/14] msm: iommu: Support cache-coherent memory access Stepan Moskovchenko
2010-11-13 3:29 ` Stepan Moskovchenko
2010-11-16 2:20 ` [PATCH 13/14 v2] " Stepan Moskovchenko
2010-11-16 2:20 ` Stepan Moskovchenko
2010-11-13 3:30 ` [PATCH 14/14] msm: iommu: Miscellaneous code cleanup Stepan Moskovchenko
2010-11-13 3:30 ` Stepan Moskovchenko
2010-11-16 0:25 ` Daniel Walker
2010-11-16 0:25 ` Daniel Walker
2010-11-16 1:16 ` Stepan Moskovchenko
2010-11-16 1:16 ` Stepan Moskovchenko
2010-11-16 20:45 ` Daniel Walker
2010-11-16 20:45 ` Daniel Walker
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