North American Network Operators Group
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Re: Adjusting TCP windows on production systems?
- From: Steve Francis
- Date: Tue Sep 30 18:34:46 2003
Just as a head up - this sort of below should not be done on things like
web servers that support lots of concurrent connections - you'll eat all
your memory for sockets.
Marshall Eubanks wrote:
On Tue, 30 Sep 2003 15:44:03 -0400
"Temkin, David" <temkin@sig.com> wrote:
Is there anyone in a production environment who, as part of their system
build process, adjusts the TCP receive window/MSS/etc. on production
systems?
As a concrete data point:
the tuning below on Solaris 9 increased the TCP data transfer rates from
SJC to NYC by a factor of 10:
(i.e. from 2 to about 20Mbps with ftp; 1 to 11Mbps with scp.)
ndd -set /dev/tcp tcp_recv_hiwat 400000
ndd -set /dev/tcp tcp_xmit_hiwat 400000
ndd -set /dev/tcp tcp_wscale_always 1
ndd -set /dev/tcp tcp_max_buf 10485760
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