From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [PATCH 1/4] md: Factor out RAID6 algorithms into lib/ Date: Fri, 17 Jul 2009 11:20:00 -0400 Message-ID: <4A6096A0.5050501@zytor.com> References: <1247494302.19180.268.camel@macbook.infradead.org> <4A5F6590.9000006@zytor.com> <4A608913.1060808@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4A608913.1060808@redhat.com> Sender: linux-raid-owner@vger.kernel.org To: Ric Wheeler Cc: Dan Williams , David Woodhouse , chris.mason@oracle.com, linux-btrfs@vger.kernel.org, neilb@suse.de, linux-raid@vger.kernel.org List-Id: linux-raid.ids Ric Wheeler wrote: > > Worth sharing a pointer to a really neat set of papers that describe > open source friendly RAID6 and erasure encoding algorithms that were > presented last year and this at FAST: > > http://www.cs.utk.edu/~plank/plank/papers/papers.html > > If I remember correctly, James Plank's papers also have implemented and > benchmarked the various encodings, > I have seen the papers; I'm not sure it really makes that much difference. One of the things that bugs me about these papers is that he compares to *his* implementation of my optimizations, but not to my code. In real life implementations, on commodity hardware, we're limited by memory and disk performance, not by CPU utilization. -hpa