Dor Laor wrote: > Haydn Solomon wrote: > I have a question on guest smp performance. If I have a host with core 2 duo, should > a kvm guest perform better using -smp 2 as opposed to not using -smp 2? > Well, it depends: > In general Avi measured 40% performance increase for using a second cpu in the guest. This was long time ago, > before the in-kernel-apic implementation. It might improve the gain of the additional cpu.
> On the other hand, for 32 bit windows, using ACPI HAL has pretty big overhead at the moment. Since it is a must > for smp guest, it might be slower than running non-acpi single cpu VM. It is possible that 64 bit SMP windows have much less overhead than 32 bit, e.g if the processors are later than Core 2 > My guess is that you better use -smp 2. > Dor. ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
