From: "H. Peter Anvin" <hpa@zytor.com>
To: Ric Wheeler <rwheeler@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
David Woodhouse <dwmw2@infradead.org>,
chris.mason@oracle.com, linux-btrfs@vger.kernel.org,
neilb@suse.de, linux-raid@vger.kernel.org
Subject: Re: [PATCH 1/4] md: Factor out RAID6 algorithms into lib/
Date: Fri, 17 Jul 2009 11:20:00 -0400 [thread overview]
Message-ID: <4A6096A0.5050501@zytor.com> (raw)
In-Reply-To: <4A608913.1060808@redhat.com>
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
next prev parent reply other threads:[~2009-07-17 15:20 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-13 14:11 [PATCH 1/4] md: Factor out RAID6 algorithms into lib/ David Woodhouse
2009-07-15 19:23 ` Dan Williams
2009-07-15 20:16 ` Chris Mason
2009-07-15 22:11 ` Dan Williams
2009-07-16 17:38 ` H. Peter Anvin
2009-07-17 14:22 ` Ric Wheeler
2009-07-17 15:20 ` H. Peter Anvin [this message]
2009-07-17 15:35 ` Ric Wheeler
2009-07-17 15:40 ` H. Peter Anvin
2009-07-17 15:47 ` Ric Wheeler
2009-07-17 15:49 ` H. Peter Anvin
2009-07-17 15:58 ` Ric Wheeler
2009-07-17 18:59 ` Alex Elsayed
2009-07-17 19:02 ` Alex Elsayed
2009-07-29 18:16 ` H. Peter Anvin
2009-07-17 19:12 ` Gregory Maxwell
2009-07-18 11:53 ` David Woodhouse
2009-07-18 12:45 ` H. Peter Anvin
2009-07-18 18:50 ` Alex Elsayed
2009-07-18 18:52 ` Alex Elsayed
2009-07-29 18:20 ` H. Peter Anvin
2009-07-18 12:49 ` Ric Wheeler
2009-07-18 16:26 ` Dan Williams
2009-07-18 18:42 ` David Woodhouse
2009-07-18 20:04 ` Dan Williams
2009-07-19 18:04 ` David Woodhouse
2009-07-20 5:21 ` H. Peter Anvin
2009-07-17 15:51 ` H. Peter Anvin
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