System tunables

[Cool_Corona]

A guy on OS forum reported that these system tunables made him reach full line rate on a multigigabit connection...

hw.ibrs_disable=1
net.isr.maxthreads=-1
net.isr.bindthreads = 1
net.isr.dispatch = deferred
net.inet.rss.enabled = 1
net.inet.rss.bits = 6
kern.ipc.maxsockbuf = 614400000
net.inet.tcp.recvbuf_max=4194304
net.inet.tcp.recvspace=65536
net.inet.tcp.sendbuf_inc=65536
net.inet.tcp.sendbuf_max=4194304
net.inet.tcp.sendspace=65536
net.inet.tcp.soreceive_stream = 1
net.pf.source_nodes_hashsize = 1048576
net.inet.tcp.mssdflt=1240
net.inet.tcp.abc_l_var=52
net.inet.tcp.minmss = 536
kern.random.fortuna.minpoolsize=128
net.isr.defaultqlimit=2048

I havent tested them yet so I cant chime in if they have any impact on performance.

[stephenw10]

On any particular hardware? What sort of rate where they seeing before/after?

None of those look like they would break anything at least! And at least some I know can improve throughput in some situations.

Steve