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authorAaron Carroll <aaronc@gelato.unsw.edu.au>2007-10-30 10:40:13 +0100
committerJens Axboe <axboe@carl.home.kernel.dk>2007-11-02 08:47:25 +0100
commit6f5d8aa6382eef2b26032c88656270bdae7f0c42 (patch)
tree6ee855ce6e8b0eb8cb04d41579ac11cb25a92759 /drivers/md/dm-table.c
parentdfb3d72a9aa519672c9ae06f0d2f93eccb35482f (diff)
Deadline iosched: Fix batching fairness
After switching data directions, deadline always starts the next batch from the lowest-sector request. This gives excessive deadline expiries and large latency and throughput disparity between high- and low-sector requests; an order of magnitude in some tests. This patch changes the batching behaviour so new batches start from the request whose expiry is earliest. Signed-off-by: Aaron Carroll <aaronc@gelato.unsw.edu.au> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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