![]() 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> |
||
---|---|---|
.. | ||
as-iosched.c | ||
blk-barrier.c | ||
blk-core.c | ||
blk-exec.c | ||
blk-ioc.c | ||
blk-map.c | ||
blk-merge.c | ||
blk-settings.c | ||
blk-sysfs.c | ||
blk-tag.c | ||
blk.h | ||
blktrace.c | ||
bsg.c | ||
cfq-iosched.c | ||
compat_ioctl.c | ||
deadline-iosched.c | ||
elevator.c | ||
genhd.c | ||
ioctl.c | ||
Kconfig | ||
Kconfig.iosched | ||
Makefile | ||
noop-iosched.c | ||
scsi_ioctl.c |