Serial traffic hoses virtual machine interactive performance?
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> | larsks @ {irc,twitter,github}
http://blog.oddbit.com/ | N1LKS