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TABLE5–1 Tuning Parameters forSolaris (Continued)
Parameter Scope Default TunedValue Comments
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 hightrac web sites, lower this
value.
tcp_rexmit_interval_initial ndd /dev/tcp 3000 3000 If retransmission is greaterthan
30-40%, you shouldincrease 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 Seton clients too.
tcp_slow_start_initial ndd /dev/tcp 1 2 Slightly fastertransmission of small
amounts of data.
tcp_xmit_hiwat ndd /dev/tcp 8129 32768 Sizeof transmit buer.
tcp_recv_hiwat ndd /dev/tcp 8129 32768 Sizeof receive buer.
tcp_conn_hash_size ndd /dev/tcp 512 8192 Sizeof connection hash table. See
“Sizing the Connection Hash Table”
on page 96
.
Sizing the Connection Hash Table
The connection hash table keeps all the information for active TCP connections. Use the
following command to get the size of the connection hash table:
ndd -get /dev/tcp tcp_conn_hash
This value does not limit the number of connections, but it can cause connection hashing to
take longer. The default size is 512.
To make lookups more ecient, set the value to half of the number of concurrent TCP
connections that are expected on the server. You can set this value only in /etc/system, and it
becomes eective at boot time.
Use the following command to get the current number of TCP connections.
netstat -nP tcp|wc -l
TuningfortheSolarisOS
SunGlassFishEnterpriseServer2.1PerformanceTuningGuide • January200996