linux-kernel - Re: [PATCH 0/3] Optimize CRC32C calculation using PCLMULQDQ in crc32c-intel module

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Date:	Wed, 26 Sep 2012 12:55:16 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	tim.c.chen@...ux.intel.com
Cc:	herbert@...dor.apana.org.au, hpa@...or.com,
	wajdi.k.feghali@...el.com, james.guilford@...el.com,
	david.m.cote@...el.com, suresh.b.siddha@...el.com,
	chaohong.guo@...el.com, austin_zhang@...ux.intel.com,
	linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org
Subject: Re: [PATCH 0/3] Optimize CRC32C calculation using PCLMULQDQ in
 crc32c-intel module

From: Tim Chen <tim.c.chen@...ux.intel.com>
Date: Tue, 25 Sep 2012 14:50:08 -0700

> This patch series optimized CRC32C calculations with PCLMULQDQ
> instruction for crc32c-intel module.  It speeds up the original
> implementation by 1.6x for 1K buffer and by 3x for buffer 4k or
> more.  The tcrypt module was enhanced for doing speed test
> on crc32c calculations.
> 
> Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>

Great work.

I intend to do something nearly identical on sparc64 since we have
similar instructions in the form of "xmulx" and "xmulxhi" which return
the lower and upper 64-bits (respectively) of a XOR multiply.

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