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Bug 503215

Summary: igb: dropping rx packets
Product: Red Hat Enterprise Linux 5 Reporter: Chris Wright <chrisw>
Component: kernelAssignee: Andy Gospodarek <agospoda>
Status: CLOSED ERRATA QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: medium Docs Contact:
Priority: low    
Version: 5.4CC: dzickus, peterm, sassmann, tao
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: 2009-09-02 08:53:20 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:
Attachments:
Description Flags
igb-igbvf-poll-fixes.patch none

Description Chris Wright 2009-05-29 17:09:55 UTC 
Description of problem:

When assigning igb device directly to KVM guest, netperf tx (from guest to external host) drops well below line rate (like 200Mb/s).

Version-Release number of selected component (if applicable):
RHEL 5.4 beta-ish (i.e. 2.6.18-150)

How reproducible:
very

Steps to Reproduce:
1. assign igb device to guest
2. generate high tx traffic rate from guest to external host
3. observe poor throughput
  
Actual results:
throughput for tcp stream netperf test falls to ~200Mb/s

Expected results:
line rate...~930Mb/s


Additional info:
Seems to be dropping large numbers of RX packets.  Also the RX interrupt rate is low.  Suspect some kind of NAPI problem.
Comment 1 Andy Gospodarek 2009-05-29 18:43:42 UTC 
Created attachment 345941 [details]
igb-igbvf-poll-fixes.patch

Patch that I will post after getting feedback from Chris that the igbvf stuff is better/not worse than before.
Comment 2 RHEL Program Management 2009-05-29 18:50:27 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 Don Zickus 2009-06-04 16:08:26 UTC 
in kernel-2.6.18-152.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Please do NOT transition this bugzilla state to VERIFIED until our QE team
has sent specific instructions indicating when to do so.  However feel free
to provide a comment indicating that this fix has been verified.
Comment 7 errata-xmlrpc 2009-09-02 08:53:20 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2009-1243.html