On 12/17/19 3:28 PM, Pavel Begunkov wrote: > percpu_ref_tryget() has its own overhead. Instead getting a reference > for each request, grab a bunch once per io_submit_sqes(). > > basic benchmark with submit and wait 128 non-linked nops showed ~5% > performance gain. (7044 KIOPS vs 7423) Confirmed about 5% here as well, doing polled IO to a fast device. That's a huge gain! -- Jens Axboe
