Thank you for your responses. :)
On Thu, Mar 31, 2011 at 6:45 AM, Julian Elischer <jul...@freebsd.org> wrote: > On 3/30/11 2:32 PM, Michael Proto wrote: > >> 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. >> > > this is many years out of date but a decade or so ago freebsd would return > ENOBUFS > and linux would block when the outgoing queues filled up. > the answer then was that teh programs are all written for Linux and didn't > check for ENOBUFS > but that may be out of date now in many different ways. > >> >> -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" >> >> > _______________________________________________ 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"
