I've got a situation where I've got a Linux guest owning an OSA-GigE, with (virtual) HiperSockets networks routed behind him.
Ping times to the HiperSockets guests are effectively instantaneous. If I ssh to the guest with the Gig-E and then SSH to the guests behind him, *that* interaction is instantaneous. But if I SSH directly to the guests on the HiperSockets, it works but the connection is unresponsive and jerky; it feels like I'm typing over a transatlantic line. Everything gets there eventually but it sometimes takes a few tenths of a second. I'm guessing that this is something to do with TCP buffering packets as they pass from one interface to another, since the problem doesn't exist with ICMP packets. Further I suspect that--since I'm running the SuSE 2.4.7-timer kernel--it may have something to do with TCP not flushing its buffers on each timer tick, since there are no timer ticks. This, however, is a guess which I have not yet attempted to construct a test case for. Has anyone else seen this behavior? Adam
