tcp troughput weirdness
danny at cs.huji.ac.il
Tue Jul 12 06:57:55 GMT 2005
> we need more data points -
> did you test tcp or udp ?
i used iperf:
Client connecting to x-dev, TCP port 5001
TCP window size: 65.0 KByte (WARNING: requested 64.0 KByte)
> who is sourcing data ?
all, I tried all combinations, and the numbers are very similar to the
ones i posted.
> are the bandwidth symmetric (i.e. A-> same as B -> A ?
yes, theys are all in the same floor, fisical distance is a few meters.
i also tried other similar boxes and the freebsd thoughput is very similar,
so i doubt it that switches or hardware is involved.
> On Tue, Jul 12, 2005 at 09:21:13AM +0300, Danny Braniss wrote:
> > while checking out the quality of a switch, I came about a very disturbing
> > dicovery: FreeBSD <-> Linux througput is MUCH better than FreeBSD <-> FreeBSD
> > Setup:
> > 2 blades in the same bladeserver, A running FreeBSD 5.4, B running Linux
> > C is running FreeBSD 5.4
> > all are connected at 1gb.
> > A -+ (FreeBSD)
> > |
> > B -+ (Linux)
> > |
> > [switch]
> > |
> > +---- [router] --- C (FreeBSD)
> > A & B are on the same Vlan.
> > iperf results:
> > Interval Transfer Bandwidth
> > A <=> B 0.0-10.0 sec 1.09 GBytes 939 Mbits/sec
> > A <=> C 0.0-10.0 sec 515 MBytes 432 Mbits/sec
> > B <=> C 0.0-10.0 sec 1.07 GBytes 918 Mbits/sec
> > I've run the tests several times, and the numbers are very similar,
> > so BIG Question: is there anything that can be tunned on the FreeBSD to
> > better the throughput?
> > danny
> > _______________________________________________
> > freebsd-net at freebsd.org mailing list
> > http://lists.freebsd.org/mailman/listinfo/freebsd-net
> > To unsubscribe, send any mail to "freebsd-net-unsubscribe at freebsd.org"
More information about the freebsd-net