On 8/26/19 11:23 AM, Hristo Venev wrote: > Both the sq and the cq rings have sizes just over a power of two, and > the sq ring is significantly smaller. By bundling them in a single > alllocation, we get the sq ring for free. > > This also means that IORING_OFF_SQ_RING and IORING_OFF_CQ_RING now mean > the same thing. If we indicate this to userspace, we can save a mmap > call. This looks pretty good to me. My only worry was ending up with sq and cq cacheline sharing, but the alignment of the io_uring struct itself should prevent that nicely. Outside of going for a cleanup, have you observed any wins from this change? -- Jens Axboe
