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| author | Aaron Carroll <aaronc@gelato.unsw.edu.au> | 2007-10-30 05:40:13 -0400 |
|---|---|---|
| committer | Jens Axboe <axboe@carl.home.kernel.dk> | 2007-11-02 03:47:25 -0400 |
| commit | 6f5d8aa6382eef2b26032c88656270bdae7f0c42 (patch) | |
| tree | 6ee855ce6e8b0eb8cb04d41579ac11cb25a92759 /include/linux/device-mapper.h | |
| parent | dfb3d72a9aa519672c9ae06f0d2f93eccb35482f (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>
Diffstat (limited to 'include/linux/device-mapper.h')
0 files changed, 0 insertions, 0 deletions