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(parent: e6c5bc7) | patch
cfq-iosched: improve hw_tag detection
authorShaohua Li <shaohua.li@intel.com>
Tue, 27 Oct 2009 07:46:23 +0000 (08:46 +0100)
committerJens Axboe <jens.axboe@oracle.com>
Tue, 27 Oct 2009 07:46:23 +0000 (08:46 +0100)
commit1a1238a7dd48e48b3bba8f426a1d61c22c80d6d1
tree08a39610689b5da8e8d61701864b8eb257acd6d7tree | snapshot
parente6c5bc737ab71e4af6025ef7d150f5a26ae5f146commit | diff
cfq-iosched: improve hw_tag detection

If active queue hasn't enough requests and idle window opens, cfq will not
dispatch sufficient requests to hardware. In such situation, current code
will zero hw_tag. But this is because cfq doesn't dispatch enough requests
instead of hardware queue doesn't work. Don't zero hw_tag in such case.

Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
block/cfq-iosched.c diff | blob | history
Domain: System / Uncategorized;