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

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Message-ID: <yq18vq17rna.fsf@sermon.lab.mkp.net>
Date:	Tue, 06 Sep 2011 08:59:53 -0400
From:	"Martin K. Petersen" <martin.petersen@...cle.com>
To:	djwong@...ibm.com
Cc:	"Martin K. Petersen" <martin.petersen@...cle.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

>>>>> "Darrick" == Darrick J Wong <djwong@...ibm.com> writes:

Darrick> I have some benchmarking data for various crc algorithms here:
Darrick> https://ext4.wiki.kernel.org/index.php/Ext4_Metadata_Checksums#Benchmarking

I've been meaning to update my own benchmark results from a few years
ago but your table is much more comprehensive. Nice work!


Darrick> Yes, the only downside to the slice-by-8 method is that it eats
Darrick> 8K of data cache for the table.  Not a huge issue on recent
Darrick> Intel and POWER where the L1D is 32K, but I imagine it could be
Darrick> painful elsewhere.

I'll see if I can come up with something better for the DIF CRC. It's
always calculated over either 512 or 4096-byte buffers.

-- 
Martin K. Petersen	Oracle Linux Engineering
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