TABLE4–2 Tuning64–bit Systems for Performance Benchmarking (Continued)
Parameter Scope DefaultValue TunedValue Comments
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 Toincrease the transmit buer.
tcp_recv_hiwat ndd /dev/tcp 8129 400000 Toincrease the receive buer.
Notethat the IPGE driver version is 1.25.25.
Disk Conguration
IfHTTP access is logged, follow these guidelines for the disk:
■Writeaccess logs on faster disks or attached storage.
■Ifrunning multiple instances, move the logs for each instance onto separate disks as much
aspossible.
■Enablethe disk read/write cache. Note that if you enable write cache on the disk, some
writesmight be lost if the disk fails.
■Considermounting the disks with the following options, which might yield better disk
performance:nologging,directio,noatime.
NetworkConguration
Ifmore than one network interface card is used, make sure the network interrupts are not all
goingto the same core. Run the following script to disable interrupts:
allpsr=‘/usr/sbin/psrinfo | grep -v off-line | awk ’{ print $1 }’‘
set $allpsr
numpsr=$#
while [ $numpsr -gt 0 ];
do
shift
numpsr=‘expr $numpsr - 1‘
tmp=1
while [ $tmp -ne 4 ];
do
/usr/sbin/psradm -i $1
shift
numpsr=‘expr $numpsr - 1‘
TuningUltraSPARC®T1–BasedSystems for Performance Benchmarking
SunJavaSystem Web Server 7.0 Update 1 Performance Tuning,Sizing, and Scaling Guide •98