[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Old Index]
Re: sysctl documentation
On Thu, Mar 13, 2008 at 07:26:33AM -0500, Michael Graff wrote:
> I've often stumbled upon a new line in my sysctl -a output, and wondered what
> exactly it does.
> Today's items:
> net.inet.tcp.recvbuf_auto = 1
> net.inet.tcp.recvbuf_inc = 16384
> net.inet.tcp.recvbuf_max = 262144
> net.inet.tcp.sendbuf_auto = 1
> net.inet.tcp.sendbuf_inc = 8192
> net.inet.tcp.sendbuf_max = 262144
> On a side note, our default send/receive socket values are small enough that
> can only get 350 kbytes/sec using scp between a 100 GB link here at IETF and
> a 1 GB link back in California. Upping these to 2x their current values let
> me get 1 megabyte/sec, and upping them to 128k on each end made my laptop's
> hard drive limit the transfer rate.
Perhaps TCP buffer auto-sizing (sendbuf_auto) is not working right?
Which sysctls did you adjust to boost the performance?
David Young OJC Technologies
dyoung%ojctech.com@localhost Urbana, IL * (217) 278-3933 ext 24
Main Index |
Thread Index |