• C
    cfq-iosched: idling on deep seeky sync queues · 76280aff
    Corrado Zoccolo 提交于
    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: NVivek Goyal <vgoyal@redhat.com>
    Signed-off-by: NCorrado Zoccolo <czoccolo@gmail.com>
    Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
    76280aff
cfq-iosched.c 76.7 KB