On 2017-09-14, Chris Cappuccio <ch...@nmedia.net> wrote: > -w1M works for me > - > Andreas Kr??ger [a...@patientsky.com] wrote: >> I do manage to read the manual, but let me clarify this. I am not >> allowed to set a buffer larger than 256KB with iperf: >> >> $ uname -a >> OpenBSD odn1-fw-odn1-01 6.0 GENERIC.MP#0 amd64
6.0 is limited to 256K, 6.1 and newer allow up to 2MB, and by default it will auto tune. As well as iperf -w, here's how to hardcode it on a few other programs: httpd/relayd "socket buffer" tcpbench -S rsync --sockopts=SO_SNDBUF=xxx,SO_RCVBUF=yyy You might be interested to watch "netstat -Bn -p tcp" if you're playing with this..
