From: Ric Wheeler <rwheeler@redhat.com>
To: "H. Peter Anvin" <hpa@zytor.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 11:58:24 -0400 [thread overview]
Message-ID: <4A609FA0.7060404@redhat.com> (raw)
In-Reply-To: <4A609D8D.8050501@zytor.com>
On 07/17/2009 11:49 AM, H. Peter Anvin wrote:
> Ric Wheeler wrote:
>>>
>>> The bottom line is pretty much this: the cost of changing the encoding
>>> would appear to outweigh the benefit. I'm not trying to claim the Linux
>>> RAID-6 implementation is optimal, but it is simple and appears to be
>>> fast enough that the math isn't the bottleneck.
>>
>> Cost? Thank about how to get free grad student hours testing out
>> things that you might or might not want to leverage on down the road :-)
>>
>
> Cost, yes, of changing an on-disk format.
>
> -hpa
>
Putting RAID6 behind us, we still might be interested in the other encodings
that are in:
"A Performance Evaluation and Examination of Open-Source Erasure Coding
Libraries For Storage"
http://www.cs.utk.edu/~plank/plank/papers/FAST-2009.html
since they give us even more flexibility....
ric
next prev parent reply other threads:[~2009-07-17 15:58 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
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 [this message]
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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4A609FA0.7060404@redhat.com \
--to=rwheeler@redhat.com \
--cc=chris.mason@oracle.com \
--cc=dan.j.williams@intel.com \
--cc=dwmw2@infradead.org \
--cc=hpa@zytor.com \
--cc=linux-btrfs@vger.kernel.org \
--cc=linux-raid@vger.kernel.org \
--cc=neilb@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).