Hi,

> I tested to transfer a file between a computer on switch1 and switch2 and
> initiatelly the speed is fine (around 10MByte/s) then with about 10secs in
> between the transferrate drops to almost zero, just to climb up again.

Sounds like there's either a duplex mismatch somewhere, or your ethernet
cards/drivers are broken.  Can you try verifying your link settings
and/or try with different cards?

I have no problems doing 300Mbit with full-size packets here (and I
can't really check beyond that as I don't have enough client hardware).


> It seems like som buffer problem or that that somewhere a icmp squenche
> gets sent,

ICMP source squench is so 1980's.. :)  Seriously, it's deprecated, and
you shouldn't see these packets anymore.


> when running vmstat 1 on the bridge/fw the context switches are ~30 000,
> when the slowdowns are it drops to 100-300 (depending how much other
> traffic thats going on right now)

Forwarding packets doesn't cause context switches.  Stop that tcpdump you
are running in the background and retry your vmstat test.


cheers,
Lennert
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