I had same problem with that kernel, I'm not sure if it is QoS or realtek driver fault, i think i had this problem before applying QoS on the realtek iface. On that machine there was an realtek and pcnet32, and i could stay connected throught ssh via pcnet32, but not realtek. Somebody found a quickfix (till I switched to 2.6.7) and made the machine ping hisself all the time so his connections never freeze, unless he stoped the ping. I hope this help On Mon, 19 Jul 2004 16:47:59 +0200, Matthias Hopf <matthias.hopf@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hi all! > > I found a rather esotheric bug / misconfiguration, and now I'm lost. > Maybe somebody else has a clue what is going on here. > > I am connected to the internet via a typical DSL router with integrated > 4-port switch. One of my computers should be able to serve local > machines at full speed, but internet bandwith usage should be limited. > Just for the record, it is running 2.4.27-pre3, but I have checked > several kernel versions (not the 2.6 series, though). Additionally, a > set of firewall rules is active. The system is rather slow with C3 > @533MHz, but has 512MB RAM. > > Now what happens is the following: With the QoS rules enabled, the > system behaves as anticipated (fast local traffic, limited internet > traffic), but suddenly for a couple of seconds it won't talk to local > computers any longer. ssh connections freeze, no ping, nothing. > Strangely enough, remote connections are still alive. Other systems can > talk with each other and are routed to the internet as well, so I > conclude that this has nothing to do with the router. This mostly > happens when a lot of upstream traffic is going on, that is, the > internet limit is hit. The time of traffic breakdown varies from event > to event and can be as large as a minute. Needless to say that the > system itself is almost idle during that time and that it won't happen > with QoS disabled. > > I narrowed down the strange behaviour and can sort of reproduce it with > the following subset of my QoS rules - the exact bandwidth limits do not > really matter, I got this with 50kbit uplink and 400kbit local traffic > and different quantum values as well: > > DEV=eth0 > LOCAL=192.168.2.0/24 > > tc qdisc add dev $DEV root handle 1: htb default 2 > # Class 1:1 local traffic > tc class add dev $DEV parent 1: classid 1:1 htb prio 1 \ > rate 80mbit quantum 32768 > # Class 1:2 remote traffic > tc class add dev $DEV parent 1: classid 1:2 htb prio 2 \ > rate 80kbit ceil 80kbit burst 2k quantum 1500 > > # Local traffic goes unconditionally to 1:1 > tc filter add dev $DEV parent 1: protocol ip prio 1 \ > u32 match ip dst $LOCAL \ > flowid 1:1 > > Any ideas? > > Thanks > > Matthias > > -- > Matthias Hopf - Visualization and Interactive Systems Group \ | | /-- > University of Stuttgart, \ | | \ > Universitaetsstr. 38, 70569 Stuttgart, Germany \| | --/ > Phone +49-711-7816-404 Fax -340 mat@xxxxxxxxx www.mshopf.de > >
