From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: longli@linuxonhyperv.com
Cc: "K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Sasha Levin <sashal@kernel.org>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
linux-hyperv@vger.kernel.org, linux-scsi@vger.kernel.org,
linux-kernel@vger.kernel.org, Long Li <longli@microsoft.com>
Subject: Re: [Patch v2] scsi: storvsc: Correctly set number of hardware queues for IDE disk
Date: Wed, 15 Jan 2020 23:03:05 -0500 [thread overview]
Message-ID: <yq1h80wnj46.fsf@oracle.com> (raw)
In-Reply-To: <1578960516-108228-1-git-send-email-longli@linuxonhyperv.com> (longli@linuxonhyperv.com's message of "Mon, 13 Jan 2020 16:08:36 -0800")
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
prev parent reply other threads:[~2020-01-16 4:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-14 0:08 [Patch v2] scsi: storvsc: Correctly set number of hardware queues for IDE disk longli
2020-01-16 4:03 ` Martin K. Petersen [this message]
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