From: "Bryan O'Sullivan" <bos@pathscale.com>
To: Andi Kleen <ak@suse.de>
Cc: akpm@osdl.org, linux-kernel@vger.kernel.org, hch@infradead.org,
rdreier@cisco.com
Subject: Re: [PATCH 3 of 3] Add __raw_memcpy_toio32 to each arch
Date: Tue, 10 Jan 2006 14:52:49 -0800 [thread overview]
Message-ID: <1136933569.6294.40.camel@serpentine.pathscale.com> (raw)
In-Reply-To: <200601102109.00067.ak@suse.de>
On Tue, 2006-01-10 at 21:08 +0100, Andi Kleen wrote:
> On Tuesday 10 January 2006 20:53, Bryan O'Sullivan wrote:
> > Most arches use the generic routine. x86_64 uses memcpy32 instead;
> > this is substantially faster, even over a bus that is much slower than
> > the CPU.
>
> So did you run numbers against the C implementation with -funroll-loops ?
> What were the results?
The C implementation is about 5% slower when copying over
HyperTransport.
<b
next prev parent reply other threads:[~2006-01-10 22:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-10 19:53 [PATCH 0 of 3] 32-bit MMIO copy routines, reworked Bryan O'Sullivan
2006-01-10 19:53 ` [PATCH 1 of 3] Introduce __raw_memcpy_toio32 Bryan O'Sullivan
2006-01-10 19:53 ` [PATCH 2 of 3] memcpy32 for x86_64 Bryan O'Sullivan
2006-01-12 8:38 ` Denis Vlasenko
2006-01-12 16:04 ` Bryan O'Sullivan
2006-01-13 9:56 ` Chris Wedgwood
2006-01-13 10:24 ` Denis Vlasenko
2006-01-13 16:21 ` Bryan O'Sullivan
2006-01-10 19:53 ` [PATCH 3 of 3] Add __raw_memcpy_toio32 to each arch Bryan O'Sullivan
2006-01-10 20:08 ` Andi Kleen
2006-01-10 22:52 ` Bryan O'Sullivan [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-01-11 22:39 [PATCH 0 of 3] MMIO 32-bit copy routine, the final frontier Bryan O'Sullivan
2006-01-11 22:39 ` [PATCH 3 of 3] Add __raw_memcpy_toio32 to each arch Bryan O'Sullivan
2006-01-11 23:46 ` Andrew Morton
2006-01-12 0:05 ` Bryan O'Sullivan
2006-01-12 0:13 ` Andrew Morton
2006-01-12 0:21 ` Bryan O'Sullivan
2006-01-06 20:26 [PATCH 0 of 3] 32-bit MMIO copy routine Bryan O'Sullivan
2006-01-06 20:26 ` [PATCH 3 of 3] Add __raw_memcpy_toio32 to each arch Bryan O'Sullivan
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