From: Joakim Tjernlund Subject: Re: [PATCH 14/14] crc32: Select an algorithm via kconfig Date: Tue, 13 Dec 2011 09:27:10 +0100 Message-ID: References: <20111201201341.5876.83743.stgit@elm3c44.beaverton.ibm.com> <20111201201517.5876.39207.stgit@elm3c44.beaverton.ibm.com> <20111202002505.GB19842@gondor.apana.org.au> <20111203023646.GB16577@tux1.beaverton.ibm.com> <20111212225857.GM7137@tux1.beaverton.ibm.com> <02ea01ccb923$48193ff0$d84bbfd0$@systemfabricworks.com> <20111213063228.GN7137@tux1.beaverton.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Cc: "'Andreas Dilger'" , "'Andrew Morton'" , "'Mingming Cao'" , "'Herbert Xu'" , "'linux-crypto'" , linux-ext4@vger.kernel.org, "'linux-fsdevel'" , "'linux-kernel'" , Bob Pearson , "'Theodore Tso'" To: djwong@us.ibm.com Return-path: In-Reply-To: <20111213063228.GN7137@tux1.beaverton.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org "Darrick J. Wong" 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