It seems to me that adding more hardware (to have fewer VMs per host) is the pragmatic way forward. Sure, we can argue that the long revert times are crazy and should be fixed, but nobody is going to do this anytime soon. Of course somebody has to setup the said new hardware and reconfigure testbot to use it, but hopefully that's something we know how to do.
Hardware is cheap, particularly if we don't need beefy machines, as the expected load is lower.
How many boxes should we buy? If I read Francois's notes on the default configuration, it seems like the pipe was originally '3', which implies two more boxes should do it.
That sound right? And would a pair of i5s with fast hard drives and 8G of RAM do the trick?
Cheers,
Jeremy