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Long Li authored
Commit 0ed88102 ("scsi: storvsc: setup 1:1 mapping between hardware queue and CPU queue") introduced a regression for disks attached to IDE. For these disks the host VSP only offers one VMBUS channel. Setting multiple queues can overload the VMBUS channel and result in performance drop for high queue depth workload on system with large number of CPUs. Fix it by leaving the number of hardware queues to 1 (default value) for IDE disks. Fixes: 0ed88102 ("scsi: storvsc: setup 1:1 mapping between hardware queue and CPU queue") Link: https://lore.kernel.org/r/1578960516-108228-1-git-send-email-longli@linuxonhyperv.comReviewed-by:
Ming Lei <ming.lei@redhat.com> Signed-off-by:
Long Li <longli@microsoft.com> Signed-off-by:
Martin K. Petersen <martin.petersen@oracle.com>
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