Sun Java System Web Server 7.0 Update 4 Performance Tuning, Sizing, and Scaling Guide

Tuning Solaris for Performance Benchmarking

The following table shows the operating system tuning for Solaris used when benchmarking for performance and scalability. These values are an example of how you can tune your system to achieve the desired result.

Table 4–1 Tuning Solaris for Performance Benchmarking


Parameter	Scope	Default Value	Tuned Value	Comments
`rlim_fd_max`	`/etc/system`	65536	65536	Process open file descriptors limit; accounts for the expected load (for the associated sockets, files, and pipes if any).
`sq_max_size`	`/etc/system`	2	0	Controls streams driver queue size; setting to 0 makes it infinite so the performance runs are not hit by lack of buffer space. Set on clients too. Note that setting s`q_max_size` to 0 is not be optimal for production systems with high network traffic.
`tcp_time_wait_interval`	`ndd /dev/tcp`	240000	60000	Set on clients too.
`tcp_conn_req_max_q`	`ndd /dev/tcp`	128	1024
`tcp_conn_req_max_q0`	`ndd /dev/tcp`	1024	4096
`tcp_ip_abort_interval`	`ndd /dev/tcp`	480000	60000
`tcp_keepalive_interval`	`ndd /dev/tcp`	7200000	900000	For high traffic web sites, lower this value.
`tcp_rexmit_interval_initial`	`ndd /dev/tcp`	3000	3000	If retransmission is greater than 30-40%, increase this value.
`tcp_rexmit_interval_max`	`ndd /dev/tcp`	240000	10000
`tcp_rexmit_interval_min`	`ndd /dev/tcp`	200	3000
`tcp_smallest_anon_port`	`ndd /dev/tcp`	32768	1024	Set on clients too.
`tcp_slow_start_initial`	`ndd /dev/tcp`	1	2	Slightly faster transmission of small amounts of data.
`tcp_xmit_hiwat`	`ndd /dev/tcp`	8129	32768	To increase the transmit buffer.
`tcp_recv_hiwat`	`ndd /dev/tcp`	8129	32768	To increase the receive buffer.