Sun Microsystems 820434310 manual 2Tuning 64-bit Systems for Performance Benchmarking

Tuning UltraSPARC® T1–Based Systems

TABLE 5–2Tuning 64–bit Systems for Performance Benchmarking

Parameter	Scope	Default Value	Tuned Value	Comments
rlim_fd_max	/etc/system	65536	260000	Process open file descriptors limit;
				should account for the expected load
				(for the associated sockets, files, pipes
				if any).
hires_tick	/etc/system		1
sq_max_size	/etc/system	2	0	Controls streams driver queue size;
				setting to 0 makes it infinite so the
				performance runs won’t be hit by lack
				of buffer space. Set on clients too.
				Note that setting sq_max_size to 0
				might not be optimal for production
				systems with high network traffic.
ip:ip_squeue_bind			0
ip:ip_squeue_fanout			1
ipge:ipge_taskq_disable	/etc/system		0
ipge:ipge_tx_ring_size	/etc/system		2048
ipge:ipge_srv_fifo_depth	/etc/system		2048
ipge:ipge_bcopy_thresh	/etc/system		384
ipge:ipge_dvma_thresh	/etc/system		384
ipge:ipge_tx_syncq	/etc/system		1
tcp_conn_req_max_q	ndd /dev/tcp	128	3000
tcp_conn_req_max_q0	ndd /dev/tcp	1024	3000
tcp_max_buf	ndd /dev/tcp		4194304
tcp_cwnd_max	ndd/dev/tcp		2097152
tcp_xmit_hiwat	ndd /dev/tcp	8129	400000	To increase the transmit buffer.
tcp_recv_hiwat	ndd /dev/tcp	8129	400000	To increase the receive buffer.

Note that the IPGE driver version is 1.25.25.

104 Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide • January 2009