On 11/9/21 3:58 PM, Daniel Black wrote: >> On Sat, Oct 30, 2021 at 6:30 PM Salvatore Bonaccorso <carnil@xxxxxxxxxx> wrote: >>> Were you able to pinpoint the issue? > > While I have been unable to reproduce this on a single cpu, Marko can > repeat a stall on a dual Broadwell chipset on kernels: > > * 5.15.1 - https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.15.1 > * 5.14.16 - https://packages.debian.org/sid/linux-image-5.14.0-4-amd64 > > Detailed observations: > https://jira.mariadb.org/browse/MDEV-26674 > > The previous script has been adapted to use MariaDB-10.6 package and > sysbench to demonstrate a workload, I've changed Marko's script to > work with the distro packages and use innodb_use_native_aio=1. > > MariaDB packages: > > https://mariadb.org/download/?t=repo-config > (needs a distro that has liburing userspace libraries as standard support) > > Script: > > https://jira.mariadb.org/secure/attachment/60358/Mariabench-MDEV-26674-io_uring-1 > > The state is achieved either when the sysbench prepare stalls, or the > tps printed at 5 second intervals falls to 0. Thanks, this is most useful! I'll take a look at this. -- Jens Axboe
