Bug 624481

Summary:	simulate the MSIx table read op to improve scalability
Product:	Red Hat Enterprise Linux 5	Reporter:	Andrew Jones <drjones>
Component:	kernel-xen	Assignee:	Xen Maintainance List <xen-maint>
Status:	CLOSED WONTFIX	QA Contact:	Red Hat Kernel QE team <kernel-qe>
Severity:	medium	Docs Contact:
Priority:	low
Version:	5.5	CC:	ddugger, ddutile, lersek, pbonzini, xen-maint
Target Milestone:	rc
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-05-30 07:56:31 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

Description Andrew Jones 2010-08-16 15:19:46 UTC

Backport Xen upstream changeset 21912

This patch simulates the MSIx table read operation to avoid read traffic caused by guest Linux kernel in a multiple guests environments running with high interrupt rate workload.(We tested 24 guests with iperf by 10Gb workload).

Comment 1 Andrew Jones 2010-08-16 15:40:30 UTC

Looks like a fairly simple backport, but not 100% trivial. Since it's a perf
enhancement and not a fix, I'll flip the flag to 5.7 (it's getting too late for
5.6).

Drew