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Bug 461513

Summary: major network performance regression in 0.97-2
Product: Red Hat Enterprise Linux 5 Reporter: Bill Burns <bburns>
Component: xenpv-winAssignee: Barry Donahue <bdonahue>
Status: CLOSED CURRENTRELEASE QA Contact: Barry Donahue <bdonahue>
Severity: medium Docs Contact:
Priority: medium    
Version: 5.2CC: jmh, 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: 2009-09-08 12:23:41 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: 518405    
Attachments:
Description Flags
iperf data from performance testing none

Description Bill Burns 2008-09-08 18:59:22 UTC 
I just run some tests with the 0.97 and 0.97.2 drivers and
	have confirmed the 0.97.2 drivers are 10x slower than the
	0.97

	Here's a simple chart

	Sender		Receiver
			dom0	 domU 0.97	domU 0.97.2	NO-PV
	domU 0.97	78.8MB/s		17.7Kb/s	40.2Mb/s
	domU 0.97.2	688Kb/s	 45.2Kb/s			3.6Kb/s
	domU NO-PV	49Mb/s	 39Mb/s		11.5Kb/s

	As you can see the 0.97.2 drivers are showing a significant performance
	regression for send and received as compared to 0.97 and non-PV
	
	I've also tried using the 0.97.2.2 drivers from Brew but the ISO
	image is not readable by the Windows guest ....
Comment 1 Jan Mark Holzer 2008-09-08 19:53:35 UTC 
Created attachment 316113 [details]
iperf data from performance testing
Comment 2 Perry Myers 2008-11-02 17:00:30 UTC 
This was fixed in 0.97.4, needs to be retested and closed.
Comment 3 Paolo Bonzini 2009-09-02 15:10:15 UTC 
Fixed.

               domU->dom0      dom0->domU
W2K3 64-bit     22 MB          40 MB
W2K8 64-bit     10 MB          17 MB
Vista 32-bit    10 MB          5 MB

The vista 32-bit performance is a bit bad, but anyway way orders of magnitude better than what was reported for 0.97.2.
Comment 4 Paolo Bonzini 2009-09-08 12:23:41 UTC 
Confirmed fixed with the latest brew build.