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| author |   Corrado Zoccolo <czoccolo@gmail.com> | 2009-11-26 10:02:58 +0100 |
|---|---|---|
| committer |   Jens Axboe <jens.axboe@oracle.com> | 2009-11-26 10:39:31 +0100 |
| commit | 76280aff1c7e9ae761cac4b48591c43cd7d69159 (patch) | |
| tree | f8b354746a96cf45a4d0fc980df4e37e3c37b173 /block/Kconfig.iosched | |
| parent | cfq-iosched: fix no-idle preemption logic (diff) | |
| download | linux-dev-76280aff1c7e9ae761cac4b48591c43cd7d69159.tar.xz linux-dev-76280aff1c7e9ae761cac4b48591c43cd7d69159.zip | |
cfq-iosched: idling on deep seeky sync queues
Seeky sync queues with large depth can gain unfairly big share of disk
time, at the expense of other seeky queues. This patch ensures that
idling will be enabled for queues with I/O depth at least 4, and small
think time. The decision to enable idling is sticky, until an idle
window times out without seeing a new request.
The reasoning behind the decision is that, if an application is using
large I/O depth, it is already optimized to make full utilization of
the hardware, and therefore we reserve a slice of exclusive use for it.
Reported-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Corrado Zoccolo <czoccolo@gmail.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/Kconfig.iosched')
0 files changed, 0 insertions, 0 deletions