tree 08a39610689b5da8e8d61701864b8eb257acd6d7
parent e6c5bc737ab71e4af6025ef7d150f5a26ae5f146
author Shaohua Li <shaohua.li@intel.com> 1256629583 +0100
committer Jens Axboe <jens.axboe@oracle.com> 1256629583 +0100

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>