User's Manual

Tuning Parameters for /etc/system
150 Portal Server 6 2005Q1 • Deployment Planning Guide
Tuning Parameters for /etc/system
Table B-2 is a list of /etc/system tuning parameters used during the performance
study. The changes are applied by appending each to the /etc/system file.
A description of all
/etc/system parameters can be found in the Solaris Tunable
Parameters Reference Manual.
Table B-3 is a list of TCP kernel tuning parameters. These are known TCP tuning
parameters that affect most performance on Portal Servers. Recommended values
for these parameters are discussed in the Identity Server Customization and API
Guide.
Table B-2 /etc/system Options
/etc/system Option Description
set rlim_fd_max=<value> "Hard" limit on file descriptors that a single process might have open. To override
this limit requires superuser privilege.
set
tcp:tcp_conn_hash_size=<value>
Controls the hash table size in the TCP module for all TCP connections.
Along with tune_t_flushr, autoup controls the amount of memory examined for
dirty pages in each invocation and frequency of file system sync operations.
set autoup=<value> The value of autoup is also used to control whether a buffer is written out from the
free list. Buffers marked with the B_DELWRI flag (file content pages that have
changed) are written out whenever the buffer has been on the list for longer than
autoup seconds.
Increasing the value of autoup keeps the buffers around for a longer time in
memory.
set tune_t_fsflushr=<value> Specifies the number of seconds between fsflush invocations.
set rechoose_interval=<value> Number of clock ticks before a process is deemed to have lost all affinity for the
last CPU it ran on. After this interval expires, any CPU is considered a candidate
for scheduling a thread. This parameter is relevant only for threads in the
timesharing class. Real-time threads are scheduled on the first available CPU.
Table B-3 TCP/IP Options
TCP/IP Options Description
ndd -set /dev/tcp
tcp_xmit_hiwat 65535
ndd -set /dev/tcp
tcp_recv_hiwat 65535
The default send window size in bytes. The default receive window
size in bytes.