From: Ted Ts'o <tytso@mit.edu>
To: Chris Mason <chris.mason@oracle.com>,
Boaz Harrosh <bharrosh@panasas.com>, Zach Brown <zab@zabbo.net>,
Eric Sandeen <sandeen@redhat.com>,
linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org
Subject: Re: [PATCH, RFC] Don't do page stablization if !CONFIG_BLKDEV_INTEGRITY
Date: Fri, 9 Mar 2012 11:20:05 -0500 [thread overview]
Message-ID: <20120309162005.GA18489@thunk.org> (raw)
In-Reply-To: <20120309010207.GM29510@shiny>
On Thu, Mar 08, 2012 at 08:02:07PM -0500, Chris Mason wrote:
> > Right before submission to the bio layer? Or right before the device
> > driver sends the request to the host bus adapter? I was thinking of
> > the latter....
>
> blktrace can probably give us numbers for how big that wait is, but
> hopefully it is very small. If it is too big, you can always bump
> nr_requests.
Not necessarily; things can get stalled for quite a while due to
ionice or io rate throttling. There's quite a lot that can happen
after submit_bio, at the cfq layer, for example.
- Ted
next prev parent reply other threads:[~2012-03-09 16:20 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-07 23:40 [PATCH, RFC] Don't do page stablization if !CONFIG_BLKDEV_INTEGRITY Theodore Ts'o
2012-03-07 23:54 ` Eric Sandeen
2012-03-08 0:05 ` Darrick J. Wong
2012-03-08 2:18 ` Darrick J. Wong
2012-03-08 3:00 ` Boaz Harrosh
2012-03-08 3:21 ` Boaz Harrosh
2012-03-08 2:39 ` Zach Brown
2012-03-08 15:54 ` Ted Ts'o
2012-03-08 18:09 ` Chris Mason
2012-03-08 20:20 ` Boaz Harrosh
2012-03-08 20:37 ` Chris Mason
2012-03-08 20:42 ` Jeff Moyer
2012-03-08 20:55 ` Chris Mason
2012-03-08 21:12 ` Ted Ts'o
2012-03-08 21:20 ` Chris Mason
2012-03-09 8:11 ` Dave Chinner
2012-03-08 20:50 ` Boaz Harrosh
2012-03-08 23:32 ` Dave Chinner
2012-03-08 21:24 ` Ted Ts'o
2012-03-08 21:38 ` Chris Mason
2012-03-08 21:41 ` Ted Ts'o
2012-03-09 1:02 ` Chris Mason
2012-03-09 1:08 ` Martin K. Petersen
2012-03-09 16:20 ` Ted Ts'o [this message]
2012-03-08 21:52 ` Boaz Harrosh
2012-03-08 0:23 ` Boaz Harrosh
2012-03-08 3:45 ` Martin K. Petersen
2012-03-08 4:37 ` Boaz Harrosh
2012-03-08 6:27 ` Sage Weil
2012-03-08 15:43 ` Ted Ts'o
2012-03-08 16:36 ` Martin K. Petersen
2012-03-08 16:43 ` Sage Weil
2012-03-15 2:10 ` Andy Lutomirski
2012-03-15 4:46 ` Boaz Harrosh
2012-03-15 5:02 ` Andy Lutomirski
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