From: Mark Nelson <markn@au1•ibm.com>
To: Anton Blanchard <anton@samba•org>
Cc: linuxppc-dev@ozlabs•org
Subject: Re: [PATCH] powerpc: pair loads and stores in copy_4k_page
Date: Thu, 11 Feb 2010 17:25:01 +1100 [thread overview]
Message-ID: <201002111725.01330.markn@au1.ibm.com> (raw)
In-Reply-To: <20100211040754.GH3399@kryten>
Hi Anton,
On Thursday 11 February 2010 15:07:54 Anton Blanchard wrote:
>
> A number of our chips like loads and stores to be paired. A small kernel
> module testcase shows the improvement of pairing loads and stores in
> copy_4k_page:
>
> POWER6: +9%
> POWER7: +1.5%
I just tried this on one of our QS22 cell blades and it seems to cause
about half a percent speedup but that looks like it's within the noise
of the results that I'm getting.
In any case it doesn't look like it has a negative effect for cell.
Looks good!
Mark
prev parent reply other threads:[~2010-02-11 6:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-11 4:07 [PATCH] powerpc: pair loads and stores in copy_4k_page Anton Blanchard
2010-02-11 6:25 ` Mark Nelson [this message]
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