[openib-general] [Bug 229] New: heavy CPU load can starve ib_mad thread on latest processors

[bugzilla-daemon at openib.org]

http://openib.org/bugzilla/show_bug.cgi?id=229

           Summary: heavy CPU load can starve ib_mad thread on latest
                    processors
           Product: OpenFabrics Linux
           Version: 1.1rc3
          Platform: All
        OS/Version: RHEL 4
            Status: NEW
          Severity: normal
          Priority: P3
         Component: IB Core
        AssignedTo: bugzilla at openib.org
        ReportedBy: sweitzen at cisco.com


RHEL4 U3 x86_64

We have a proprietary test tool that places a very heavy CPU load on system. 
When this test is run on an IB host on Intel Woodcrest, AMD Opteron (Rev F, I
believe, not sure about Rev G), and PowerPC JS21 systems, IB port goes from
ACTIVE to INIT state.  The workaround is to renice the ib_mad thread to highest
priority, we recommend changing the OpenIB code to do this when ib_mad thread
is created.

This does not seem to happen on older Intel or AMD processors, dunno about
PowerPC.




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