Bug 841622

Summary:	add virtio-scsi unlocked kick patches
Product:	Red Hat Enterprise Linux 6	Reporter:	Paolo Bonzini <pbonzini>
Component:	kernel	Assignee:	Paolo Bonzini <pbonzini>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	6.3	CC:	areis, juzhang, knoel, pbonzini, perfbz, shu, sluo, wdai
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	All
Whiteboard:
Fixed In Version:	kernel-2.6.32-328.el6	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-02-21 06:40:53 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Paolo Bonzini 2012-07-19 15:38:50 UTC

Here are some results with varying number of disks on the same controller (data in MB/s, using fio, ioengine=libaio, iodepth=4):

#    6.3          unlocked kick       unlocked kick
#                 1 target            1 LUN/target
# --------------------------------------------------------------
1    303.679      343.454             << same configuration
2    343.979      393.545             460.247
4    409.953      447.683             455.197 (probably a fluke)
8    438.526      449.390             474.092
16   427.363      448.377             478.958

Comment 2 RHEL Program Management 2012-07-20 16:00:04 UTC

This request was evaluated by Red Hat Product Management for
inclusion in a Red Hat Enterprise Linux release.  Product
Management has requested further review of this request by
Red Hat Engineering, for potential inclusion in a Red Hat
Enterprise Linux release for currently deployed products.
This request is not yet committed for inclusion in a release.

Comment 4 Jarod Wilson 2012-10-10 19:43:53 UTC

Patch(es) available on kernel-2.6.32-328.el6

Comment 8 Shaolong Hu 2013-01-05 09:57:34 UTC

Hi Paolo,

Do you think QE need to repeat your test in comment 0? if so, could you provide qemu-kvm command line and fio command line in guest? In command 0, the "1 2 4 8 16" means boot guest with 1, 2, 4, 8, 16 scsi disks and in guest run fio with -filename=/dev/sda:/dev/sdb:/dev/sdc... ?

If not, we have tested virtio scsi and blk in a lot of test runs since kernel 328, could we simply verify this one based on there is no regression?

Comment 9 Shaolong Hu 2013-01-06 02:53:46 UTC

We have

Comment 10 Shaolong Hu 2013-01-06 02:59:17 UTC

Since kernel 328, we have tested virtio scsi:
Test run for qemu-kvm-0.12.1.2-2.331.el6 - virtio scsi - RHEL6.4-64

And lots of test runs use virtio scsi as block device, no regression so far, for sanity test, i'd like to set this one verified.

Comment 11 Paolo Bonzini 2013-01-09 13:49:53 UTC

I believe sanity testing is enough.

Comment 13 errata-xmlrpc 2013-02-21 06:40:53 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.

http://rhn.redhat.com/errata/RHSA-2013-0496.html