| commit | 4dab46ff26c6003a13ec769312c50938b93c359d | [log] [tgz] |
|---|---|---|
| author | Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> | Thu Jul 22 14:17:00 2010 -0700 |
| committer | Jens Axboe <jaxboe@fusionio.com> | Sat Aug 07 18:52:53 2010 +0200 |
| tree | 02d6f99222034dfeb73ccb388663570db883cb52 | |
| parent | e96f6abe02fc3320d669985443e8c68ff8e83294 [diff] |
xen/blkfront: use tagged queuing for barriers When barriers are supported, then use QUEUE_ORDERED_TAG to tell the block subsystem that it doesn't need to do anything else with the barriers. Previously we used ORDERED_DRAIN which caused the block subsystem to drain all pending IO before submitting the barrier, which would be very expensive. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>