QLogic OFED+ Host Software User Guide, Rev. B

F–Troubleshooting
QLogic MPI Troubleshooting
NOTE:
• The contents of the smp_affinity file may not reflect the expected
values, even though the affinity change has taken place.
• If the driver is reloaded, the affinity assignment will revert to the default,
so you will need to reset it to the desired value.
You can look at the stats in /proc/interrupts while the adapter is active to
observe which CPU is fielding ib_qib interrupts.
Performance Warning if ib_qib Shares Interrupts with eth0
When ib_qib shares interrupts with eth0, performance may be affected the
OFED ULPs, such as IPoIB. A warning message appears in syslog, and also on
the console or tty session where /etc/init.d/openibd start is run (if
messages are set up to be displayed). Messages are in this form:
Nov 5 14:25:43 infinipath: Shared interrupt will
affect performance: vector 169: devices eth0, ib_qib
Check /proc/interrupts: "169" is in the first column, and "devices" are shown
in the last column.
You can also contact your system vendor to see if the BIOS settings can be
changed to avoid the problem.
QLogic MPI Troubleshooting
Problems specific to compiling and running MPI programs are described in the
following sections.
D000046-005 B F-11