User guide

3–InfiniBand
®
Cluster Setup and Administration
Performance Settings and Management Tips
3-32 IB0054606-02 A
 value is the parameter value for the particular unit or port.
The fields in the square brackets are options; however, either a default or a
per-unit/per-port value is required.
Example usage:
To set the default IB MTU to 1K for all ports on all units:
ibmtu=3
To set the IB MTU to 256-bytes for unit 0/port 1 and 4096-bytes for unit 0/port 2:
ibmtu=0:1=1,0:2=5
To set the default IB MTU to 2K for all ports but specify 4K for unit 0/port 1:
ibmtu=4,0:1=5
To singleport to OFF as default and turn it ON for unit 1:
singleport=0,1=1
To set number of configured contexts to 10 on unit 0 and 16 on unit 1:
cfgctxts=0=10,1=16
A user can identify HCAs and correlate them to system unit numbers by using the
-b option (beacon mode option) to the ipath_control script. Issuing the
following command (as root):
ipath_control -u unit -b on
Where:
unit is the system unit number will cause that HCA to start blinking the
LEDs on the face of the board in an alternating pattern.
Once the board has been identified, the user can return the LEDs to normal mode
of operation with the following command (as root):
ipath_control -u unit -b off
numa_aware
The Non-Uniform Memory Access (NUMA) awareness (numa_aware) module
parameter enables driver memory allocations in the same memory domain or
NUMA node of the HCA. This improves the overall system efficiency with CPUs
on the same NUMA node having faster access times and higher bandwidths to
memory.
The default is:
option ib_qib numa_aware=10