Messages in this thread |  | | Subject | Re: [PATCH 2/2] io_uring: batch getting pcpu references | | From | Jens Axboe <> | | Date | Tue, 17 Dec 2019 17:02:57 -0700 |
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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
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