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Bug 841622 - add virtio-scsi unlocked kick patches
Summary: add virtio-scsi unlocked kick patches
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.3
Hardware: x86_64
OS: All
medium
medium
Target Milestone: rc
: ---
Assignee: Paolo Bonzini
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-07-19 15:38 UTC by Paolo Bonzini
Modified: 2013-02-21 06:40 UTC (History)
8 users (show)

Fixed In Version: kernel-2.6.32-328.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-02-21 06:40:53 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2013:0496 0 normal SHIPPED_LIVE Important: Red Hat Enterprise Linux 6 kernel update 2013-02-20 21:40:54 UTC

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
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