From: Mike Fedyk <mfedyk@matchmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: New RAID-6 snapshot
Date: Tue, 30 Dec 2003 10:43:36 -0800 [thread overview]
Message-ID: <20031230184336.GU1882@matchmail.com> (raw)
In-Reply-To: <3FF1C589.3070906@zytor.com>
On Tue, Dec 30, 2003 at 10:35:53AM -0800, H. Peter Anvin wrote:
> Mike Fedyk wrote:
> >On Tue, Dec 30, 2003 at 03:34:28AM -0800, H. Peter Anvin wrote:
> >
> >>Well, I implemented read-modify-write for RAID-6, and at least on my
> >>6-disk system it was a small but measurable performance *loss*.
> >
> >What was your previous patch doing instead?
>
> The published snapshots (including the latest, since I backed out
> read-modify-write) all do read-reconstruct-write.
Does that mean that RRW (as the name seems to imply) would need to read the
entire stripe before it could write back the updated stripe compared to a
partial read with RMW?
next prev parent reply other threads:[~2003-12-30 18:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-30 11:34 New RAID-6 snapshot H. Peter Anvin
2003-12-30 17:24 ` Mike Fedyk
2003-12-30 18:35 ` H. Peter Anvin
2003-12-30 18:43 ` Mike Fedyk [this message]
2003-12-30 18:51 ` H. Peter Anvin
2003-12-30 18:58 ` Mike Fedyk
2003-12-30 19:22 ` 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=20031230184336.GU1882@matchmail.com \
--to=mfedyk@matchmail.com \
--cc=hpa@zytor.com \
--cc=linux-raid@vger.kernel.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.