Bug 720986

Summary:	vlapic: backport EOI fast path
Product:	Red Hat Enterprise Linux 5	Reporter:	Paolo Bonzini <pbonzini>
Component:	kernel-xen	Assignee:	Paolo Bonzini <pbonzini>
Status:	CLOSED ERRATA	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	medium	Docs Contact:
Priority:	low
Version:	5.7	CC:	drjones, lersek, pbonzini, qguan, qwan, xen-maint
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2012-02-21 03:44:57 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:
Bug Depends On:
Bug Blocks:	514490, 648852

Comment 1 Laszlo Ersek 2011-07-13 17:24:54 UTC

Paolo posted
http://post-office.corp.redhat.com/archives/rhkernel-list/2011-July/msg00610.html

Comment 2 RHEL Program Management 2011-08-04 04:09:30 UTC

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

Comment 4 Jarod Wilson 2011-08-23 14:05:50 UTC

Patch(es) available in kernel-2.6.18-282.el5
You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5
Detailed testing feedback is always welcomed.

Comment 6 Qin Guan 2011-12-29 03:19:48 UTC

Verify this problem with 2.6.18-301.el5.

To test the kernel build time:
1. Install a host with kernel-xen 2.6.18-301.el5, and boot with the xen kernel
2. build kernel with the src rpm for three times and record the time:
# time rpmbuild -bb --target=x86_64 kernel.spec
3. downgrade the kernel to RHEL5.7 released kernel (2.6.18-274.el5)
4. repeat step 2

It uses less time after the fix, below is the result:

Step 2 (after):
real        56m7.636s          user        79m48.695s          sys        15m58.556s
real        53m39.934s        user        79m53.972s          sys        16m9.361s
real        52m45.541s        user        79m53.576s          sys        16m31.394s

Step 4 (before):
real        60m27.100s         user        84m13.988s          sys        13m50.640s
real        61m28.617s         user        84m22.500s          sys        14m1.193s
real        60m44.717s         user        84m21.696s          sys        13m58.276s

Comment 7 errata-xmlrpc 2012-02-21 03:44:57 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-2012-0150.html