tcp troughput weirdness

[Luigi Rizzo]

we need more data points -
did you test tcp or udp ?
who is sourcing data ?
are the bandwidth symmetric (i.e. A-> same as B -> A ?

cheers
luigi

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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