Hello! > My guess: You give the system average packet size so it can actually work on > packet counter level. The guess is wrong, cbq counts byte rates, of course. Average packet size contributes only to second order effects sort of bursts. Probably, he configured shaping allowing too large latency and ACKs are messed with data of another connection, randomly delayed and, maybe, even dropped. Also, most likely, this triggers bugs in rtt estimation in linux-2.2. One way is to select sane latency bounds, another is to classify ACKs to separate class. > Can anyone explain what is going on? No. Such questions REQUIRE tcpdumps. Alexey - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html