This is a very interesting subject.
Is there any official paper describing how to tune TCP on OpenBSD?
Googling i found this two interesting links, but none specifically
mentions OpenBSD:
Enabling high performance data transfers
http://www.psc.edu/networking/projects/tcptune/
TCP tuning cookbook
http://proj.sunet.se/E2E/tcptune.html
This other paper is about OpenBSD, but i do not know how accurate is it:
Network and speed performance guide (OpenBSD)
https://calomel.org/network_performance.html
Opinions?
Marcos
Markus Hennecke escribis:
Jesus Sanchez schrieb:
Jean-Frangois SIMON escribis:
Hi all,
It looks like the max bandwidth of ftp is somehow 350 Kb/s.
Is this normaland if so can it be increased ?
?? it must be your bandwidth limit, there's nothing
about a 350 kb/s limit anywhere. please, read carefulle
the ftp manpage.
As there are some information missing, I look into my crystal ball and
see that Jean-Frangois is downloading with help of the ftp program via
DSL which is either 6Mbit or faster.
Due to the latency of the DSL line the standard settings for
net.inet.tcp.recvspace (see sysctl) are not correct for this kind of
setup. He should try to increase it, for me 65536 works on 6Mbit DSL.
Please tell me in case this is all wrong so that I can order a new
crystal ball!
Enough guessing, HTH
Markus
