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Bug 432196 - Enable Infiniband connected mode support (CONFIG_INFINIBAND_IPOIB_CM) in kernel config
Enable Infiniband connected mode support (CONFIG_INFINIBAND_IPOIB_CM) in kern...
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
All Linux
low Severity medium
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
Depends On:
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Reported: 2008-02-09 13:34 EST by Gregory Maxwell
Modified: 2008-11-26 10:48 EST (History)
0 users

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2008-11-26 10:48:31 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Gregory Maxwell 2008-02-09 13:34:54 EST
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 2008-02-10 19:50:14 EST
Enabled in rawhide.
Comment 2 Bug Zapper 2008-11-26 04:45:39 EST
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bug reports from releases that are no longer maintained.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.

Bug Reporter: Thank you for reporting this issue and we are sorry that 
we may not be able to fix it before Fedora 8 is end of life.  If you 
would still like to see this bug fixed and are able to reproduce it 
against a later version of Fedora please change the 'version' of this 
bug to the applicable version.  If you are unable to change the version, 
please add a comment here and someone will do it for you.

Although we aim to fix as many bugs as possible during every release's 
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The process we are following is described here: 
Comment 3 Gregory Maxwell 2008-11-26 10:48:31 EST
It was fixed 2008-02-10 and was fine in Fedora 9.

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