linux-kernel - Re: [patch] speed up single bio

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Date:	08 Dec 2006 03:27:54 +0100
From:	Andi Kleen <ak@...e.de>
To:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [patch] speed up single bio_vec allocation

"Chen, Kenneth W" <kenneth.w.chen@...el.com> writes:
> 
> I tried to use cache_line_size() to find out the alignment of struct bio, but
> stumbled on that it is a runtime function for x86_64.

It's a single global variable access:

#define cache_line_size() (boot_cpu_data.x86_cache_alignment)

Or do you mean it caused cache misses?  boot_cpu_data is cache aligned
and practically read only, so there shouldn't be any false sharing at least.

-Andi

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