On 11/16/22 11:31 AM, Jakub Kicinski wrote: > On Mon, 14 Nov 2022 23:08:57 -0800 Stefan Roesch wrote: >> This adds the napi busy polling support in io_uring.c. It adds a new >> napi_list to the io_ring_ctx structure. This list contains the list of >> napi_id's that are currently enabled for busy polling. This list is >> used to determine which napi id's enabled busy polling. >> >> To set the new napi busy poll timeout, a new io-uring api has been >> added. It sets the napi busy poll timeout for the corresponding ring. >> >> There is also a corresponding liburing patch series, which enables this >> feature. The name of the series is "liburing: add add api for napi busy >> poll timeout". It also contains two programs to test the this. >> >> Testing has shown that the round-trip times are reduced to 38us from >> 55us by enabling napi busy polling with a busy poll timeout of 100us. > > Acked-by: Jakub Kicinski <kuba@xxxxxxxxxx> > > Thanks! Thanks Jakub! Question on the need for patch 3, which I think came about because of comments from you. Can you expand on why we need both an enable and timeout setting? Are there cases where timeout == 0 and enabled == true make sense? -- Jens Axboe
