On Mon, 05 Dec 2022 02:44:24 +0000, Pavel Begunkov wrote:
> Optimise CQ locking for event posting depending on a number of ring setup flags.
> QD1 nop benchmark showed 12.067 -> 12.565 MIOPS increase, which more than 8.5%
> of the io_uring kernel overhead (taking into account that the syscall overhead
> is over 50%) or 4.12% of the total performance. Naturally, it's not only about
> QD1, applications can submit a bunch of requests but their completions will may
> arrive randomly hurting batching and so performance (or latency).
>
> [...]
Applied, thanks!
[1/7] io_uring: skip overflow CQE posting for dying ring
commit: 3dac93b1fae0b90211ed50fac8c2b48df1fc01dc
[2/7] io_uring: don't check overflow flush failures
commit: a3f63209455a1d453ee8d9b87d0e07971b3c356e
[3/7] io_uring: complete all requests in task context
commit: ab857514be26e0050e29696f363a96d238d8817e
[4/7] io_uring: force multishot CQEs into task context
commit: 6db5fe86590f68c69747e8d5a3190b710e36ffb2
[5/7] io_uring: post msg_ring CQE in task context
commit: d9143438fdccc62eb31a0985caa00c2876f8aa75
[6/7] io_uring: use tw for putting rsrc
commit: 3a65f4413a2ccd362227c7d121ef549aa5a92b46
[7/7] io_uring: skip spinlocking for ->task_complete
commit: 65a52cc3de9d7a93aa4c52a4a03e4a91ad7d1943
Best regards,
--
Jens Axboe
