linux-kernel - Re: [PATCH v1 00/16] ext4: Add metadata checksumming

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Message-ID: <6fdb58aed1dae8020900e65cbfb34b28.squirrel@www.firstfloor.org>
Date:	Sun, 4 Sep 2011 18:54:28 +0200
From:	"Andi Kleen" <andi@...stfloor.org>
To:	"Martin K. Petersen" <martin.petersen@...cle.com>
Cc:	djwong@...ibm.com, "Greg Freemyer" <greg.freemyer@...il.com>,
	"Andreas Dilger" <adilger.kernel@...ger.ca>,
	"Theodore Tso" <tytso@....edu>,
	"Sunil Mushran" <sunil.mushran@...cle.com>,
	"Amir Goldstein" <amir73il@...il.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Andi Kleen" <andi@...stfloor.org>,
	"Mingming Cao" <cmm@...ibm.com>,
	"Joel Becker" <jlbec@...lplan.org>,
	"linux-fsdevel" <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, "Coly Li" <colyli@...il.com>
Subject: Re: [PATCH v1 00/16] ext4: Add metadata checksumming

> On Westmere and beyond it is possible to accelerate generic CRC
> calculation using the PCLMULQDQ operation. There are many of our CRC

Faster than the lookup table? That's hard to believe.

-Andi

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