On Mon, Dec 23, 2013 at 04:38:54PM +0100, Erik Auerswald wrote: > Hi, > > On 12/23/2013 08:12 AM, Paride Legovini wrote: > >On Mon, Dec 23, 2013 at 04:22:08AM +0100, Carl-Daniel Hailfinger wrote: > >>Am 22.12.2013 18:10 schrieb Paride Legovini: > >>>I'm working in an Antarctic research station where our connection to the > >>>Internet is a 512kbps satellite link. > >> > >>Assuming that the satellite link is expensive and has long roundtrip > >>times, it is probably a wise idea not to throw away any data which has > >>already been sent over the satellite link. > > > >You're perfectly right here: the link is expensive and the round trip is > >700ms at best, but reaches easily 3000ms or even 4000ms when the network > >is congested. > > Those long RTTs will get even longer if you add shaping of your own. > Most software is written with much shorter RTTs in mind, triggering > retransmits after one to three seconds without acknowledgement or > reply. > This kind of behavior can cripple goodput of the satellite link. You > might want to keep this in mind when designing traffic shaping. Dear Erik, I agree that this is a very important point. The fact is that I don't work in the ICT team here (and I'm happy I don't!). I'm in charge for some scientific projects here and I somehow took over the task of developing a system to send data to the civilized world, as I want it to be done as I say. This means that I'm already behind a firewall, a commercial product which configuration if unknown to me. That's it! Paride -- To unsubscribe from this list: send the line "unsubscribe lartc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
