SGI Altrix - 1024 CPUS

SGI NUMA

XEN - dom0 does all I/O

“Its Rusty’s fault”

Be aware cost of accessing memory varies depending on node memory is stored on.

Status: dom0 boots and explodes.

Combine dom0 & xen?

• no - security issues

In principle, no scalability problems in Xen (with current code base problems exist).