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authorAlan D. Brunelle <Alan.Brunelle@hp.com>2008-04-29 16:44:19 +0400
committerJens Axboe <jens.axboe@oracle.com>2008-04-29 16:48:55 +0400
commitac9fafa1243640349aa481adf473db283a695766 (patch)
tree155c2371cca8971638d781269f39fa015bc6509c /drivers/cdrom
parentd7e3c3249ef23b4617393c69fe464765b4ff1645 (diff)
downloadlinux-ac9fafa1243640349aa481adf473db283a695766.tar.xz
block: Skip I/O merges when disabled
The block I/O + elevator + I/O scheduler code spend a lot of time trying to merge I/Os -- rightfully so under "normal" circumstances. However, if one were to know that the incoming I/O stream was /very/ random in nature, the cycles are wasted. This patch adds a per-request_queue tunable that (when set) disables merge attempts (beyond the simple one-hit cache check), thus freeing up a non-trivial amount of CPU cycles. Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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