On 9/20/07, Farkas Levente <[EMAIL PROTECTED]> wrote: > 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. > > can you tell me what does the HAL means here? and what's kind of HAL > exists what are the advantage/disadvantages them. how can i > change/configure this?
Hardware Abstraction Layer. See: http://support.microsoft.com/kb/99588 http://en.wikipedia.org/wiki/Architecture_of_Windows_NT Luca ------------------------------------------------------------------------- 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
