I have a pair of virtual machines connected via a serial link. Machine `node0.virt` is configured like this: <serial type="unix"> <source mode="bind" path="/tmp/serial0"/> <target type="isa-serial" port="1"> <model name="isa-serial"/> </target> <alias name="serial1"/> </serial> And machine `node1.virt` is configured like this: <serial type="unix"> <source mode="connect" path="/tmp/serial0"/> <target type="isa-serial" port="1"> <model name="isa-serial"/> </target> <alias name="serial1"/> </serial> If I have any sort of file transfer running over the serial link (e.g., a zmodem file transfer over raw serial, or an `scp` over a SLIP or PPP connection), the interactive performance of the *receiving* machine (accessed via the console or over a network connection) tanks -- it becomes almost unusable until the file transfer completes (or is cancelled). What's going on there, and is there a way to improve the performance? (Same behavior when connected using a pty device instead of a unix socket.) -- Lars Kellogg-Stedman <lars(a)redhat.com&gt; | larsks @ {irc,twitter,github} http://blog.oddbit.com/ | N1LKS