Bug 599332 - e1000 and e1000e driver behaviour differences [rhel-5.5.z]
Summary: e1000 and e1000e driver behaviour differences [rhel-5.5.z]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel
Version: 5.3
Hardware: All
OS: Linux
urgent
urgent
Target Milestone: rc
: ---
Assignee: Jiri Pirko
QA Contact: Red Hat Kernel QE team
URL:
Whiteboard:
: 599331 (view as bug list)
Depends On: 586416
Blocks:
TreeView+ depends on / blocked
 
Reported: 2010-06-03 07:10 UTC by RHEL Program Management
Modified: 2015-05-05 01:20 UTC (History)
13 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
The e1000 and e1000e drivers for Intel PRO/1000 network devices were updated with an enhanced algorithm for adaptive interrupt modulation in the Red Hat Enterprise Linux 5.1 release. When InterruptThrottleRate was set to "1" (thus enabling the new adaptive mode), certain traffic patterns could have caused high CPU usage. This update provides a way to set InterruptThrottleRate to "4", which switches the mode back to the simpler and non-adaptive algorithm. Doing so may decrease CPU usage by the e1000 and e1000e drivers depending on traffic patterns. Note: you can change the InterruptThrottleRate setting using the ethtool utility by running the following command: ethtool -C ethX rx-usecs 4
Clone Of:
Environment:
Last Closed: 2010-07-01 18:28:38 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2010:0504 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2010-07-01 18:26:58 UTC

Description RHEL Program Management 2010-06-03 07:10:50 UTC 
This bug has been copied from bug #586416 and has been proposed
to be backported to 5.5 z-stream (EUS).
Comment 4 Don Howard 2010-06-03 17:08:19 UTC 
*** Bug 599331 has been marked as a duplicate of this bug. ***
Comment 5 Jiri Pirko 2010-06-07 13:31:16 UTC 
in 2.6.18-194.6.1.el5
Comment 9 Douglas Silas 2010-06-28 20:29:32 UTC 
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.

New Contents:
The e1000 and e1000e drivers for Intel PRO/1000 network devices were updated with an enhanced algorithm for adaptive interrupt modulation in the Red Hat Enterprise Linux 5.1 release. When InterruptThrottleRate was set to "1" (thus enabling the new adaptive mode), certain traffic patterns could have caused high CPU usage. This update provides a way to set InterruptThrottleRate to "4", which switches the mode back to the simpler and non-adaptive algorithm. Doing so may decrease CPU usage by the e1000 and e1000e drivers depending on traffic patterns.

Note: you can change the InterruptThrottleRate setting using the ethtool utility by running the following command:

    ethtool -C ethX rx-usecs 4
Comment 11 errata-xmlrpc 2010-07-01 18:28:38 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-2010-0504.html
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