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authorJens Axboe <jens.axboe@oracle.com>2009-07-30 08:18:24 +0200
committerJens Axboe <jens.axboe@oracle.com>2009-09-11 14:33:31 +0200
commitfb1e75389bd06fd5987e9cda1b4e0305c782f854 (patch)
tree6658e13f80d4f6450f5a69c82d3bf1b590ecf234 /block/Makefile
parent1f98a13f623e0ef666690a18c1250335fc6d7ef1 (diff)
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block: improve queue_should_plug() by looking at IO depths
Instead of just checking whether this device uses block layer tagging, we can improve the detection by looking at the maximum queue depth it has reached. If that crosses 4, then deem it a queuing device. This is important on high IOPS devices, since plugging hurts the performance there (it can be as much as 10-15% of the sys time). Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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