On Thu, Apr 24, 2025 at 11:19 AM Ofer Oshri <ofer@xxxxxxxxxx> wrote: > > Hi, > > Our code uses a single io_uring per core, which is shared among all block devices - meaning each block device on a core uses the same io_uring. > > Let’s say the size of the io_uring is N. Each block device submits M UBLK_U_IO_FETCH_REQ requests. As a result, with the current implementation, we can only support up to P block devices, where P = N / M. This means that when we attempt to support block device P+1, it will fail due to io_uring exhaustion. What do you mean by "size of the io_uring", the submission queue size? Why can't you submit all P * M UBLK_U_IO_FETCH_REQ operations in batches of N? Best, Caleb
