On Mon, 2017-10-23 at 17:12 +0200, Roman Penyaev wrote: > On Fri, Oct 20, 2017 at 10:05 PM, Bart Van Assche wrote: > > Commit 6d8c6c0f97ad is something I came up with to fix queue lockups in the > > SCSI and dm-mq drivers. > > You mean fairness? (some hctx get less amount of chances to be restarted). > That's why you need to restart them in RR fashion, right? Commit 6d8c6c0f97ad not only improved fairness but also fixed a lockup scenario. After a driver tag has been freed not only the hw queues of the request queue for which a request completed must be reexamined but also the hw queues associated with the other request queues that share the same tag set. Bart.
