linux-ext4 - Re: [PATCH 14/14] crc32: Select an algorithm via kconfig

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Message-ID: <OF62576D22.A1ACD2B5-ONC1257965.002E3817-C1257965.002E6F16@transmode.se>
Date:	Tue, 13 Dec 2011 09:27:10 +0100
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	djwong@...ibm.com
Cc:	"'Andreas Dilger'" <adilger.kernel@...ger.ca>,
	"'Andrew Morton'" <akpm@...ux-foundation.org>,
	"'Mingming Cao'" <cmm@...ibm.com>,
	"'Herbert Xu'" <herbert@...dor.apana.org.au>,
	"'linux-crypto'" <linux-crypto@...r.kernel.org>,
	linux-ext4@...r.kernel.org,
	"'linux-fsdevel'" <linux-fsdevel@...r.kernel.org>,
	"'linux-kernel'" <linux-kernel@...r.kernel.org>,
	Bob Pearson <rpearson@...temfabricworks.com>,
	"'Theodore Tso'" <tytso@....edu>
Subject: Re: [PATCH 14/14] crc32: Select an algorithm via kconfig

"Darrick J. Wong" <djwong@...ibm.com> wrote on 2011/12/13 07:32:28:
>
> On Mon, Dec 12, 2011 at 05:10:45PM -0600, Bob Pearson wrote:
> > That choice was for Joakim who measured better performance on his 32 bit PPC
> > platform with "by 4".
>
> Ok.  On my 1.33GHz PowerBook I get ~255MB/s with slice by 4 and ~270MB/s with
> slice by 8.  I think it's a PPC 7447, and definitely 32-bit.  In any case, it
> reports having 32K of L1D cache.

I tested Bobs early version on my mpc8321(266MHz, embedded CPU) and it was just
half the speed compared with current crc32.

 Jocke

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