lguest performance

Posted Feb 2, 2007 12:13 UTC (Fri) by rusty (guest, #26)
In reply to: An introduction to lguest by job
Parent article: An introduction to lguest

> So what's performance like?

Poor. Last I did a guest kernel compile, it was twice as slow as running in the host (mind you, the guest only had 512M of ram, the host had 3G, so some can be explained away).

That said, there are plenty of low hanging fruit left, and progress is being made quickly. Balancing small code vs. performance is going to be the trick, but I'd hope to get within 25% of native on all reasonable benchmarks. Of course, for some things it's there already, but context-switch-heavy loads really show the weakness of the shadow page table implementation, for example.

I often put virtbench results into checkin comments, which you can see here:
http://ozlabs.org/~rusty/paravirt/

Cheers!
Rusty.