Sp/X Switch Device Buffer Driver Buffer Pools - IBM High Performance Storage System HPSS Installation Manual

4.6.2. SP/x Switch Device Buffer Driver Buffer Pools

IBM SP/x systems provide the capability to tune the buffer pool allocation in the switch device
driver. Two variables can be changed: rpoolsize, which is the size of the buffer pool for incoming
data, and spoolsize which is the buffer pool size for outgoing data. If these values are too small, then
buffer overruns may occur.
The current values of these variables can be interrogated with the lsattr command (e.g., lsattr -E -l
css0), and can be changed with the chgcss command (e.g., chgcss -l css0 -a spoolsize=<new size> -a
rpoolsize=<new size>). Refer to the IBM Parallel System Support Programs for AIX Administration
Guide, GC23-3897-02 for more details.
HPSS Installation Guide July 2008
Release 6.2 (Revision 2.0) 133