Bug 613900 - [RHEL5.5] TCP bandwidth problems with TPA and bnx2x cards [rhel-5.5.z]
[RHEL5.5] TCP bandwidth problems with TPA and bnx2x cards [rhel-5.5.z]
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel (Show other bugs)
5.5
All Linux
medium Severity medium
: rc
: ---
Assigned To: Jiri Pirko
Red Hat Kernel QE team
: ZStream
Depends On: 593801
Blocks:
  Show dependency treegraph
 
Reported: 2010-07-13 03:14 EDT by RHEL Product and Program Management
Modified: 2015-05-04 21:20 EDT (History)
10 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
When TPA (Transparent Packet Aggregation) was used with a bnx2x network driver (10 Gb), TCP bandwidth problems occurred, causing transfer rate slowdowns (down to 400 Kb) and network delays. The network traces shown that the reason for the TCP bandwidth problems were TCP delayed ACK mechanisms. This update improves the packet-handling code so that network ACKs are not delayed when using TPA, GRO (Generic Receive Offload), or LRO (Large Receive Offload) with the bnx2x driver, thus leading to increased networking performance.
Story Points: ---
Clone Of:
Environment:
Last Closed: 2010-08-10 14:02:36 EDT
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CRM:
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---


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Description RHEL Product and Program Management 2010-07-13 03:14:36 EDT
This bug has been copied from bug #593801 and has been proposed
to be backported to 5.5 z-stream (EUS).
Comment 3 Jiri Pirko 2010-07-22 06:53:19 EDT
in 2.6.18-194.10.1.el5
Comment 6 errata-xmlrpc 2010-08-10 14:02:36 EDT
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-2010-0610.html
Comment 7 Martin Prpič 2010-08-17 06:45:23 EDT
    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:
When TPA (Transparent Packet Aggregation) was used with a bnx2x network driver (10 Gb), TCP bandwidth problems occurred, causing transfer rate slowdowns (down to 400 Kb) and network delays. The network traces shown that the reason for the TCP bandwidth problems were TCP delayed ACK mechanisms. This update improves the packet-handling code so that network ACKs are not delayed when using TPA, GRO (Generic Receive Offload), or LRO (Large Receive Offload) with the bnx2x driver, thus leading to increased networking performance.

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