From: Jordan Russell <jr-list-2010@quo.to>
To: Bill Davidsen <davidsen@tmr.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: Data-check brings system to a standstill
Date: Mon, 21 Jun 2010 23:06:35 -0500 [thread overview]
Message-ID: <4C2036CB.7090505@quo.to> (raw)
In-Reply-To: <4C19015B.3020807@tmr.com>
On 6/16/2010 11:52 AM, Bill Davidsen wrote:
> Alternatively, you can try setting your io scheduler to
> deadline,
Wow - huge difference! No "hung task" warnings, no processes stuck in
"D" state; the system remains completely responsive throughout the
entire check.
I don't see why, though, processes are blocking for 2+ minutes on the
simplest of I/O operations when the default CFQ scheduler is used. Isn't
CFQ supposed to distribute I/O bandwidth in a "completely fair" manner?
Do md checks bypass the fairness algorithm?
--
Jordan Russell
next prev parent reply other threads:[~2010-06-22 4:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-09 17:30 Data-check brings system to a standstill Jordan Russell
2010-06-16 16:52 ` Bill Davidsen
2010-06-18 16:54 ` Jordan Russell
2010-06-18 17:10 ` Tim Small
2010-06-18 17:27 ` Jordan Russell
2010-06-22 4:06 ` Jordan Russell [this message]
2010-06-22 18:50 ` Bill Davidsen
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=4C2036CB.7090505@quo.to \
--to=jr-list-2010@quo.to \
--cc=davidsen@tmr.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.