tcp troughput weirdness

[Danny Braniss]

> 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.

> cheers
> luigi

thanks,
	danny

> 
> 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
> > 
> > 	
> > 
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