Solaris 9 Tuning parameters change

Each version of Solaris Change some default parameters in Solaris kernel
Those changes, should be documented in the release note, but AFAIK is not..
They are documented in the document  Solaris Tuunable Parameters Reference Manual
Here let's discuss few of them on Appendix

maxusers

Range 1 to 2048 to: Range 1 to 2048, based on physical memory without any setting in the /etc/system file. 1 to 4096, if set in the /etc/system file.

rlim_fd_max

Default 1024  to: Default 65,536

shmsys:shminfo_shmseg

Limit on the number of shared memory segments that any one process can attach.

shmsys:shminfo_shmmax

Default 1,048,576 to:Default 8,388,608

sq_max_size

Range 1 to 0 (unlimited) to Range 0 (unlimited) to MAXINT

tcp_rexmit_interval_max

Range 1 millisecond to 20 seconds to: Range 1 millisecond to 2 hours

tcp_xmit_hiwat

Default 16384 to Default 49,152

tcp_recv_hiwat

Default 24576 to Default 49,152

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