linux-ext4 - Re: [PATCH, RFC] Don't do page stablization if !CONFIG_BLKDEV

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Date:	Fri, 9 Mar 2012 11:20:05 -0500
From:	Ted Ts'o <tytso@....edu>
To:	Chris Mason <chris.mason@...cle.com>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Zach Brown <zab@...bo.net>, Eric Sandeen <sandeen@...hat.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH, RFC] Don't do page stablization if
 !CONFIG_BLKDEV_INTEGRITY

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
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