Re: [PATCH] arm64: Increase the max granular size

From	Catalin Marinas <catalin.marinas@arm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] arm64: Increase the max granular size
Date	2015-10-28 20:20 +0100
Message-ID	<qoEql-6NV-7@gated-at.bofh.it> (permalink)
References	<qbAaT-4xo-59@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Tue, Sep 22, 2015 at 07:59:48PM +0200, Robert Richter wrote:
> From: Tirumalesh Chalamarla <tchalamarla@cavium.com>
> 
> Increase the standard cacheline size to avoid having locks in the same
> cacheline.
> 
> Cavium's ThunderX core implements cache lines of 128 byte size. With
> current granulare size of 64 bytes (L1_CACHE_SHIFT=6) two locks could
> share the same cache line leading a performance degradation.
> Increasing the size fixes that.
> 
> Increasing the size has no negative impact to cache invalidation on
> systems with a smaller cache line. There is an impact on memory usage,
> but that's not too important for arm64 use cases.
> 
> Signed-off-by: Tirumalesh Chalamarla <tchalamarla@cavium.com>
> Signed-off-by: Robert Richter <rrichter@cavium.com>

Applied. Thanks.

-- 
Catalin
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Re: [PATCH] arm64: Increase the max granular size Catalin Marinas <catalin.marinas@arm.com> - 2015-10-28 20:20 +0100

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