linux-kernel - Re: [Patch v2] scsi: storvsc: Correctly set number of hardware queues for IDE disk

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Date:   Wed, 15 Jan 2020 23:03:05 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     longli@...uxonhyperv.com
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-hyperv@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Long Li <longli@...rosoft.com>
Subject: Re: [Patch v2] scsi: storvsc: Correctly set number of hardware queues for IDE disk


Long,

> Commit 0ed881027690 ("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.

Applied to 5.5/scsi-fixes, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering