There are many webpages devoted to tweaking system setting to maximize
performance of a DSL connection. Most suggestion boil down to
increasing the "receive window" to a larger value (16 to 32K, rather
than the default 2K). These are for windows machines.

How would I go about tweaking this kind of setting on a Solaris
machine? In a previous life, as a grad student, nearly 10 years back,
I administered many Unix machines at Stanford. Thus, I am well
familiar with Unix. However, I have never done this sort of tweaks on
a Unix machine.

I would appreciate hearing from anyone who uses DSL on a solaris
machine and has tweaked some system settings to optimize connection
performance.

Thanks.

Bhoot Nath

In article <309e7c98.0309051455.4296ae83@posting.google.com >, deja_bhoot2000
@yahoo.com (Bhoot Nath) writes...
> There are many webpages devoted to tweaking system setting to maximize
> performance of a DSL connection. Most suggestion boil down to
> increasing the "receive window" to a larger value (16 to 32K, rather
> than the default 2K). These are for windows machines.
>
> How would I go about tweaking this kind of setting on a Solaris
> machine? In a previous life, as a grad student, nearly 10 years back,
> I administered many Unix machines at Stanford. Thus, I am well
> familiar with Unix. However, I have never done this sort of tweaks on
> a Unix machine.
>
> I would appreciate hearing from anyone who uses DSL on a solaris
> machine and has tweaked some system settings to optimize connection
> performance.
>
> Thanks.
>
> Bhoot Nath


Here's a page but it seems pretty overcomplicated:
http://www.sean.de/Solaris/soltune.html


Here's another one but they need to learn something about formatting:
http://www.ebsinc.com/solaris/tcp_faq.html



Here's a summary of settings, taken from
http://developers.sun.com/solaris/ar...nce_tools.html

Probably the most important ones are the ones at the top, default
values are listed:



/etc/rc2.d/S69inet Option Description
-------------------------------------

ndd -set /dev/tcp tcp_xmit_hiwat 65535
The default send window size in bytes.


ndd -set /dev/tcp tcp_recv_hiwat 65535
The default receive window size in bytes.


ndd -set /dev/tcp tcp_cwnd_max 65535
The maximum value of TCP congestion window (cwnd) in bytes.


ndd -set /dev/tcp tcp_rexmit_interval_min 3000
The default minimum retransmission timeout (RTO) value in milliseconds.
The calculated RTO for all TCP connections cannot be lower than this value.


ndd -set /dev/tcp tcp_rexmit_interval_max 10000
The default maximum retransmission timeout value (RTO) in milliseconds.
The calculated RTO for all TCP connections cannot exceed this value.


ndd -set /dev/tcp tcp_rexmit_interval_initial 3000
The default initial retransmission timeout value (RTO) in milliseconds.


ndd -set /dev/tcp tcp_time_wait_interval 60000
The time in milliseconds a TCP connection stays in TIME-WAIT state. Refer
to RFC 1122, 4.2.2.13 for more information.


ndd -set /dev/tcp tcp_keepalive_interval 900000
The time in milliseconds a TCP connection stays in KEEP-ALIVE state. Refer
to RFC 1122, 4.2.2.13 for more information.


ndd -set /dev/tcp tcp_conn_req_max_q 1024
The default maximum number of pending TCP connections for a TCP listener
waiting to be accepted by accept(SOCKET).


ndd -set /dev/tcp tcp_conn_req_max_q0 4096
The default maximum number of incomplete (three-way handshake not yet
finished) pending TCP connections for a TCP listener.
Refer to RFC 793 for more information on TCP three-way handshake.


ndd -set /dev/tcp tcp_ip_abort_interval 60000
The default total retransmission timeout value for a TCP connection in
milliseconds. For a given TCP connection, if TCP has been re-transmitting for
tcp_ip_abort_interval period and it has not received any acknowledgment
from the other endpoint during this period, TCP closes this connection.


ndd -set /dev/tcp tcp_smallest_anon_port 1024
The default port number where anonymous port allocation is allowed (default: ?).




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