Re: Virtualization Performance: Intel vs. AMD

Andi Kleen
2009-11-16T12:02:19Z

Thomas Fjellstrom <tfjellstrom@shaw.ca> writes:

> Hardware context switches aren't free either.

FWIW, SMT has no "hardware context switches", the 'S' stands for
simultaneous: the operations from the different threads are travelling
simultaneously through the CPU's pipeline.

You seem to confuse it with 'CMT' (Coarse-grained Multi Threading),
which has context switches.

-Andi