On Mon 11-01-21 17:47:15, Jan Kara wrote: > Hello! > > This patch series aims to fix a regression we've noticed on our test grid when > support for multiple HW queues in megaraid_sas driver was added during the 5.10 > cycle (103fbf8e4020 scsi: megaraid_sas: Added support for shared host tagset > for cpuhotplug). The commit was reverted in the end for other reasons but I > believe the fundamental problem still exists for any other similar setup. The > problem manifests when the storage card supports multiple hardware queues > however storage behind it is slow (single rotating disk in our case) and so > using IO scheduler such as BFQ is desirable. See the second patch for details. > > Changes since v2 > * Modified code to avoid useless sbitmap_any_set() calls on submit path > > Changes since v1 > * Fixed queue running code to don't leave pending requests that bypass IO > scheduler. Jens, can you please pickup these patches? Thanks! Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
