http://www.psc.edu/networking/projects/tcptune/
I'm wondering if any of this freebsd tuning info is relevant to pfsense,
has it already been done, are there any benefits to setting any of
these things (some of which are missing - there seems to be no
/etc/rc.conf on pfsense - where is it?).
Procedure for raising network limits under FreeBSD
All system parameters can be read or set with 'sysctl'. E.g.:
sysctl [parameter]
sysctl -w [parameter]=[value]
You can raise the maximum socket buffer size by, for example:
sysctl -w kern.ipc.maxsockbuf=4000000
You can also set the TCP and UDP default buffer sizes using the variables
net.inet.tcp.sendspace
net.inet.tcp.recvspace
net.inet.udp.recvspace
When using larger socket buffers, you probably need to make sure that
the TCP window scaling option is enabled. (The default is not enabled!)
Check 'tcp_extensions="YES"' in /etc/rc.conf and ensure it's enabled via
the sysctl variable:
net.inet.tcp.rfc1323
FreeBSD's TCP has a thing called "inflight limiting" turned on by
default, which can be detrimental to TCP throughput in some situations.
If you want "normal" TCP behavior you should
sysctl -w net.inet.tcp.inflight_enable=0
You may also want to confirm that SACK is enabled: (working since
FreeBSD 5.3):
net.inet.tcp.sack.enable
MTU discovery is on by default in FreeBSD. If you wish to disable MTU
discovery, you can toggle it with the sysctl variable:
net.inet.tcp.path_mtu_discovery
Contributors: Pekka Savola and David Malone.
/Checked for FreeBSD 5.3, May 2006/
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