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authorDivyesh Shah <dpshah@google.com>2009-01-30 12:46:41 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-01-30 12:47:33 +0100
commit3a9a3f6cc55418dd1525e636dccbbe13c394f652 (patch)
treeb23c46b8ecec0a338e4e81454e482f7dcd3ded0c /fs
parentbc58ba9468d94d62c56ab9b47173583ec140b165 (diff)
cfq-iosched: Allow RT requests to pre-empt ongoing BE timeslice
This patch adds the ability to pre-empt an ongoing BE timeslice when a RT request is waiting for the current timeslice to complete. This reduces the wait time to disk for RT requests from an upper bound of 4 (current value of cfq_quantum) to 1 disk request. Applied Jens' suggeested changes to avoid the rb lookup and use !cfq_class_rt() and retested. Latency(secs) for the RT task when doing sequential reads from 10G file. | only RT | RT + BE | RT + BE + this patch small (512 byte) reads | 143 | 163 | 145 large (1Mb) reads | 142 | 158 | 146 Signed-off-by: Divyesh Shah <dpshah@google.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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