From: Herbert Xu <herbert@gondor.apana.org.au>
Subject: Re: [PATCH v3 0/4] Patchset to use PCLMULQDQ to accelerate
 CRC-T10DIF checksum computation
Date: Tue, 14 May 2013 10:35:26 +0800
Message-ID: <20130514023526.GB19306@gondor.apana.org.au>
References: <cover.1367436101.git.tim.c.chen@linux.intel.com>
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Cc: "H. Peter Anvin" <hpa@zytor.com>,
	"David S. Miller" <davem@davemloft.net>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	James Bottomley <James.Bottomley@HansenPartnership.com>,
	Matthew Wilcox <willy@linux.intel.com>,
	Jim Kukunas <james.t.kukunas@linux.intel.com>,
	Keith Busch <keith.busch@intel.com>,
	Erdinc Ozturk <erdinc.ozturk@intel.com>,
	Vinodh Gopal <vinodh.gopal@intel.com>,
	James Guilford <james.guilford@intel.com>,
	Wajdi Feghali <wajdi.k.feghali@intel.com>,
	Jussi Kivilinna <jussi.kivilinna@iki.fi>,
	linux-kernel <linux-kernel@vger.kernel.org>,
	linux-crypto@vger.kernel.org, linux-scsi@vger.kernel.org
To: Tim Chen <tim.c.chen@linux.intel.com>
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On Wed, May 01, 2013 at 12:52:47PM -0700, Tim Chen wrote:
> Currently the CRC-T10DIF checksum is computed using a generic table lookup
> algorithm.  By switching the checksum to PCLMULQDQ based computation,
> we can speedup the computation by 8x for checksumming 512 bytes and
> even more for larger buffer size.  This will improve performance of SCSI
> drivers turning on the CRC-T10IDF checksum.  In our SSD based experiments,
> we have seen increase disk throughput by 3.5x with T10DIF for 512 byte
> block size.
> 
> This patch set provides the x86_64 routine using PCLMULQDQ instruction
> and switches the crc_t10dif library function to use the faster PCLMULQDQ
> based routine when available.
> 
> Tim
> 
> v3
> 1. Update the crct10dif crypto transform used in the crct10dif library in a safe way.
> 2. Load the accelerated t10dif transform for the x86_64 cpus that support it.
> 3. Added generic crct10dif crypto transform.

All applied.  Thanks Tim.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt