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author | Alan D. Brunelle <Alan.Brunelle@hp.com> | 2008-04-29 16:44:19 +0400 |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2008-04-29 16:48:55 +0400 |
commit | ac9fafa1243640349aa481adf473db283a695766 (patch) | |
tree | 155c2371cca8971638d781269f39fa015bc6509c /kernel/relay.c | |
parent | d7e3c3249ef23b4617393c69fe464765b4ff1645 (diff) | |
download | linux-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>
Diffstat (limited to 'kernel/relay.c')
0 files changed, 0 insertions, 0 deletions