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:

quoted

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