Question about the *-cpu* option

Hi.
there is a * -cpu qemu64,+sse2 * in the command line http://cleo.tlv.redhat.com/qumrawiki/DanKenigsberg/QemuCli
could any one tell me what's this mean ?
should i set the cpu model as *core2duo* if my host's cpu is *Intel(R) Core(TM)2 Duo CPU* ?

Thanks

qemu64 is the "safe" CPU type every modern CPU should support. The +sse2 means that additionally SSE2 should be exposed to the guest. IIRC SSE2 is part of the qemu64 description already though, so that's a rather useless option.

If you don't need to migrate virtual machines you can use the core2duo option to expose a virtual CPU to the guest that's really close to a real Core 2 Duo. It's not necessary though and might break under certain conditions.

I usually use the qemu64 CPU type on every machine I have, unless I run a guest operating system that's picky about the CPU it runs on (Mac OS X and Hyper-V mostly).

Alex