On Sat, 26 Feb 2022 17:04:29 -0600, Mike Christie wrote: > In: > > https://lore.kernel.org/all/CAK3e-EZbJMDHkozGiz8LnMNAZ+SoCA+QeK0kpkqM4vQ4pz86SQ@xxxxxxxxxxxxxx/t/ > > Zhengyuan Liu found an issue where failovers are taking a long time > with lots of devices (/dev/sdXYZ nodes). The problem is that iscsid > expects most nl operations to be fast (ignoring mem issues) and when > the session block code was written blocking a queue/scsi_device was > just setting some flag bits and state values more or less. Now a block > call will actually handle IO that has been sent to the driver, so it > can be expensive. When you add in more and more devices, then a > session block call will take longer and longer. > > [...] Applied to 5.18/scsi-queue, thanks! [1/6] scsi: iscsi: Fix recovery and ublocking race. https://git.kernel.org/mkp/scsi/c/8dd3dff3bf3e [2/6] scsi: iscsi: Speed up session unblocking and removal. https://git.kernel.org/mkp/scsi/c/b07c348f8ffb [3/6] scsi: iscsi: Remove iscsi_scan_finished. https://git.kernel.org/mkp/scsi/c/d8ec5d67b8bb [4/6] scsi: iscsi, ql4: Use per session workqueue for unbinding. https://git.kernel.org/mkp/scsi/c/5842ea366831 [5/6] scsi: iscsi: Use the session workqueue for recovery. https://git.kernel.org/mkp/scsi/c/7cb6683ce761 [6/6] scsi: iscsi: Drop temp workq_name. https://git.kernel.org/mkp/scsi/c/69af1c9577aa -- Martin K. Petersen Oracle Linux Engineering
