https://bugzilla.kernel.org/show_bug.cgi?id=201685 --- Comment #229 from Jens Axboe (axboe@xxxxxxxxx) --- (In reply to Guenter Roeck from comment #228) > I guess I should have been more specific. With CONFIG_SCSI_MQ_DEFAULT=y (or > scsi_mod.use_blk_mq=1), cfq is not available. That applies to any kernel > version with CONFIG_SCSI_MQ_DEFAULT=y (or scsi_mod.use_blk_mq=1), not just > to 4.19, and it doesn't apply to 4.19 if CONFIG_SCSI_MQ_DEFAULT=n (or > scsi_mod.use_blk_mq=0). > > It is quite irrelevant if other schedulers are available if > CONFIG_SCSI_MQ_DEFAULT=y (or scsi_mod.use_blk_mq=1). cfq is not available, > and it doesn't matter if it is set as default or not. > > I hope this is specific enough this time. My apologies if I missed some > other means to enable or disable blk_mq. My clarification was for Steven, not you. In terms of scheduler, CFQ will change the patterns a lot. For the non-mq case, I'd recommend using noop or deadline for testing, otherwise I fear we're testing a lot more than mq vs non-mq. -- You are receiving this mail because: You are watching the assignee of the bug.
