Product specifications

QLogic OFED+ Host Software Page 18 of 20
If a non-blank output occurs, then debuginfo is enabled. If a blank line is output,
then debuginfo is disabled on the present system.
When running QLogic SRP over two ports in round robin mode, performance is
degraded.
When running verbs-based benchmarks such as ib_send_bw, the following message
may appear:
BUG: soft lockup - CPU#1 stuck for 10s.
This message does not impact completion or correctness of the benchmark.
The ib_send_bw benchmark, when run in UC mode, is written such that it will hang if
even one packet is dropped.
The QLogic 12000 series switch firmware must be at version 6.0.0.1.2 or later to
connect with the TrueScale Host Channel Adapters in this release.
QLE7240/QLE7280 performance with Barcelona stepping B2 and the BIOS/kernel
workaround for AMD errata 298 can lead to reduced InfiniBand bandwidth, as a
result of poor memory bandwidth and latency on the adapters due to the
workaround. To fix this problem, upgrade to Barcelona stepping B3 (or later).
mpirun-debug option fails to open xterm windows. A race condition may occur when
there are multiple processes trying to lock the $HOME/.Xauthority file concurrently.
An error similar to this may occur:
/usr/X11R6/bin/xauth: error in locking authority file
/home/<user>/.Xauthority
Disable X11 forwarding by setting the environment variable $MPI_SHELL_X='ssh -
x'. Then set the DISPLAY environment variable with the mpirun -display option.
For example:
env MPI_SHELL_X='ssh -x' mpirun -debug -display\
<X11_display_hostname:display_number.screen_number> [...] (continued on
same line)
Additional information on interrupt request (IRQ) affinity settings. The following
information will be added to the information in the QLogic OFED+ Host Software
Users Guide, Appendix F Troubleshooting, section Performance Issues, sub-section
Erratic Performance:
To immediately change the processor affinity of an IRQ, execute a command similar
to the following, as a root user:
echo 01 > /proc/irq/$my_irq/smp_affinity
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.
Look at the stats in /proc/interrupts while the adapter is active to see which CPU
is fielding ib_qib interrupts.