On Wed, Mar 30, 2011 at 3:43 PM, Kyungsoo Lee <ulsan...@gmail.com> wrote: > Hi All, > > I want to check UDP on FreeBSD. > > I am using IPERF on FreeBSD for wireless testing with Proxim 8470 FC PCMCIA > card on IBM T42 and T61. > > When I'm transmitting data from FreeBSD to FreeBSD or CentOS using Iperf > with -u -b 100M on iperf, they had lost lots of packets. Sniffer near the > two nodes shows the sender could not send all packets. Iperf sender said > that they try to send 85469 packets but they lost 68824 packets. I think > that the UDP buffer on the sender could not handle all packets. > > But if I'm trying to send data from CentOS to FreeBSD using Iperf with -u -b > 100M option on iperf, the sender tries 18636 packets so they lost few > packets like 1 or 2 packets.As a result, they have similar bandwidth result > on the report. I think that it happens from different implement between > FreeBSD and Linux. > > But I want to double check that this is normal for FreeBSD or not. If I have > some missing points, let me know please. > > Thank you! > _______________________________________________ > freebsd-net@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-net > To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org" >
Just a guess, but have you tried adjusting the net.inet.udp.maxdgram sysctl? I believe the default is somewhat low for UDP transmit. I don't know what size packets iperf is using but increasing the maxdgram value might help your testing. -Proto _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
