On Fri, Dec 14, 2001 at 12:05:20AM +1100, Mathew McKernan wrote:
> > I'm not exactly sure what you mean with your question. If you are asking
> > whether linux ever drops packets, I can assure you that it will. If you
> > are bridging from 100Mbit to 10Mbit, it takes ten times longer to transmit
> > the data than to receive it, so if insist that no packets be dropped, even
> > if you put the 100Mbit under load for a day, you will need 10 days worth
> > of 10Mbit buffering capacity in the bridge, which is about a terabyte.
>
> I know we dont run our LAN that hard :P, but i see what your saying.
One thing that might make a difference if you have wide variation in
link utilisation is altering the transmit queue length on the slow
interface, this effectively increases the amount of data that will be
buffered for sending (the default is 100 packets). This _will_ increase
forwarding latency under high load, though. It won't help the case
where you have constant high load.
ip link set eth0 txqueuelen 200
cheers,
Lennert
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