Sun Microsystems 2005Q1 manual Tuning Parameters for /etc/system, Etc/system Options

Tuning Parameters for /etc/system

Tuning Parameters for /etc/system

Table B-2is a list of /etc/system tuning parameters used during the performance study. The changes are applied by appending each to the /etc/system file.

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		Controls the hash table size in the TCP module for all TCP connections.
tcp:tcp_conn_hash_size=<value>		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.

A description of all /etc/system parameters can be found in the Solaris Tunable Parameters Reference Manual.

Table B-3is 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-3TCP/IP Options

TCP/IP Options	Description
ndd -set /dev/tcp	The default send window size in bytes. The default receive window
tcp_xmit_hiwat 65535	size in bytes.
ndd -set /dev/tcp
tcp_recv_hiwat 65535

150 Portal Server 6 2005Q1 • Deployment Planning Guide