Bug 1210166

Summary:	[vioscsi] Add multiqueue support to Windows virtio-scsi driver.
Product:	Red Hat Enterprise Linux 7	Reporter:	Vadim Rozenfeld <vrozenfe>
Component:	virtio-win	Assignee:	Vadim Rozenfeld <vrozenfe>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	ailan, jherrman, juzhang, lijin, lmiksik, michen, rbalakri, virt-maint, vrozenfe, wquan, wyu, ymankad
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:	In addition to supporting single-queue mode, the vioscsi driver is now fully functional in multi-queue mode.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-04 08:44:43 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1288337

Description Vadim Rozenfeld 2015-04-09 05:23:31 UTC

Description of problem:
Current implementation of Windows virtio-scsi driver doesn't provide multiqueue support. 

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. Specify the number of queues associated with virtio pci device bigger than 1. 
2. Run Windows VM with vioscsi driver installed.
3.

Actual results:
vioscsi driver will crate only one virtio queue to submit requests to the qemu
backend.

Expected results:
vioscsi driver should be able to crate a number of queues to submit concurent requests simultaneously.

Additional info:

Comment 2 Xiaomei Gao 2015-04-22 10:18:51 UTC

Hi Vadim,

How to check multiqueue is enabled in windows guest? We can't get the queues info using DebugView tools after disabling and enabling virtio-scsi driver.

Thanks,
Xiaomei

Comment 3 Vadim Rozenfeld 2015-04-22 23:28:07 UTC

(In reply to Xiaomei Gao from comment #2)
> Hi Vadim,
> 
> How to check multiqueue is enabled in windows guest? We can't get the queues
> info using DebugView tools after disabling and enabling virtio-scsi driver.
> 
> Thanks,
> Xiaomei

Hi Xiaomei,
Unfortunately, there is no way to get such kind of information at the moment.
I can try adding WPP software tracing support if it is absolutely needed.

Best regards,
Vadim.

Comment 8 Xiaomei Gao 2015-04-23 06:15:25 UTC

(In reply to Vadim Rozenfeld from comment #5)
> No problem. Just open a new bug, assigned to me, with request for adding WPP
> tracing facility.

Okay, We have filed Bug 1214568 to track the request.

Thanks,
Xiaomei

Comment 9 lijin 2015-07-17 07:45:01 UTC

change status to verified as qe can run scsi whql job with queues > 1 with virtio-win-prewhql-105

Comment 13 Vadim Rozenfeld 2015-09-30 05:48:35 UTC

Current implementation of vioscsi MQ doesn't show any performance improvement over single queue. Moving this feature to 7.3 for more precise performance analysis and improvement.

Comment 18 lijin 2016-09-02 08:22:47 UTC

change status to verified as qe can pass scsi whql&functional test with queues > 1 with virtio-win-prewhql-124

Comment 20 errata-xmlrpc 2016-11-04 08:44:43 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2609.html