Nuutti Kotivuori wrote: > As a workaround to the problem, I've added the IFF_ONE_QUEUE option > to all the places that open a tap device (namely tunctl, uml_net and > uml_router). The patch is attached. But the actual problem should > most likely be fixed once found.
Just a heads up here to the UML folks in case it was missed - with the current code, packet delivery to UML machines using tuntap driver *will* mess up (stall totally or major bursts of lag) if more than 10 packets are queued to UML at a time. This will happen if Linux reassembles packets (connection tracking is enabled) and a packet of around 17000 bytes or more arrives, or if UML is given packets faster than it can handle them (not very likely to happen if the packets are received from a 100Mbit network, and not generated locally, unless there is heavy load on the machine). So this is a real problem, for which the patch given is a decent workaround, as it works perfectly and only changes things if one employs QoS on the tap device itself. Ofcourse, the actual cause for this should be fixed (SIGIO mess up or whatever it is). -- Naked ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
