linux-kernel - Re: Update cacheline size on X86

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Message-ID: <20081011140119.GC12131@one.firstfloor.org>
Date:	Sat, 11 Oct 2008 16:01:19 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	Andi Kleen <andi@...stfloor.org>, Dave Jones <davej@...hat.com>,
	x86@...nel.org, Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Update cacheline size on X86_GENERIC

> No immediate ideas. Jens probably is a good person to cc. With direct IO
> workloads, hd_struct should mostly only be touched in partition remapping
> and IO accounting.

I found it doubtful if grouping the rw and ro members together was a good
idea.

> At this point, you would want to cacheline align hd_struct. So if you

The problem is probably not false sharing, but simply cache misses because it's
so big. I think.

-Andi
-- 
ak@...ux.intel.com
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