Messages in this thread | | | Date | Wed, 2 Nov 2016 15:54:59 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH 3/4] blk-mq: implement hybrid poll mode for sync O_DIRECT |
| |
On Tue, Nov 01, 2016 at 03:05:24PM -0600, Jens Axboe wrote: > This patch enables a hybrid polling mode. Instead of polling after IO > submission, we can induce an artificial delay, and then poll after that. > For example, if the IO is presumed to complete in 8 usecs from now, we > can sleep for 4 usecs, wake up, and then do our polling. This still puts > a sleep/wakeup cycle in the IO path, but instead of the wakeup happening > after the IO has completed, it'll happen before. With this hybrid > scheme, we can achieve big latency reductions while still using the same > (or less) amount of CPU. > > Signed-off-by: Jens Axboe <axboe@fb.com>
This looks very nice. I'll need to run some tests before giving the formal ACK, though.
| |