Bug 432196 - Enable Infiniband connected mode support (CONFIG_INFINIBAND_IPOIB_CM) in kernel config
Summary: Enable Infiniband connected mode support (CONFIG_INFINIBAND_IPOIB_CM) in kern...
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: 8
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2008-02-09 18:34 UTC by Gregory Maxwell
Modified: 2008-11-26 15:48 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2008-11-26 15:48:31 UTC

Attachments (Terms of Use)

Description Gregory Maxwell 2008-02-09 18:34:54 UTC
Description of problem:
CONFIG_INFINIBAND_IPOIB_CM is not enabled in the configuration of kernels that
Fedora ships.  This means that users of connected mode must build their own kernels.

With CONFIG_INFINIBAND_IPOIB_CM enabled connected mode is still not activated
until a user asks for it through sysfs, i.e. "echo connected >
/sys/class/net/ib0/mode", so activating the option does not result in a change
of default behavior.

Without connected mode infiniband can only use a 2k MTU for IP traffic.

Large MTUs can result in significant performance increases (150 MBytes/sec TCP
-> 700Mbytes/sec TCP, on my systems when changing to 64k MTU).

How reproducible:
Install Fedora
Actual results:
Infiniband connected mode is not available.

Expected results:
Infiniband connected mode is available.

Comment 1 Chuck Ebbert 2008-02-11 00:50:14 UTC
Enabled in rawhide.

Comment 2 Bug Zapper 2008-11-26 09:45:39 UTC
This message is a reminder that Fedora 8 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 8.  It is Fedora's policy to close all
bug reports from releases that are no longer maintained.  At that time
this bug will be closed as WONTFIX if it remains open with a Fedora 
'version' of '8'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version prior to Fedora 8's end of life.

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we may not be able to fix it before Fedora 8 is end of life.  If you 
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against a later version of Fedora please change the 'version' of this 
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The process we are following is described here: 

Comment 3 Gregory Maxwell 2008-11-26 15:48:31 UTC
It was fixed 2008-02-10 and was fine in Fedora 9.

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