Hello, I've compiled a new kernel v2.6.27-rc5 with the modified svm.c. But the behaviour of the vlc process in the guest is still the same. I've exported additional cpu features to the guest, e.g. mmxext with kvm-84. But no performance changes. I was not able to export the cpu flags 3dnow and 3dnowext to the guest, no error but they are not visible in /proc/cpuinfo. Not sure why. Regards Stefanie BRAUN, Stefanie wrote: > qemu-kvm -cpu ? only shows > qemu64, qemu32, 486, pentium, pentium2, pentium3, athlon > It can also take additional +feature or -feature parameters. Oh, maybe kvm-84 doesn't have this support? try http://userweb.kernel.org/~avi/kvm-85rc6/. -----Ursprüngliche Nachricht----- Von: Avi Kivity [mailto:avi@xxxxxxxxxx] Gesendet: Dienstag, 14. April 2009 10:48 An: BRAUN, Stefanie Cc: kvm@xxxxxxxxxxxxxxx Betreff: Re: AW: AW: AW: AW: KVM performance BRAUN, Stefanie wrote: > Hello, > the host runs on a Dual-Core AMD Opteron Processor. > Does there exist a similar AMD parameter? > You can add individual host cpu features by using '-cpu qemu64,+feature', where feature is taken from the host /proc/cpuinfo. Do you know which cpu features the program can take advantage of? Also please try replacing the constant 0x0007040600070406ULL in kernel/x86/svm.c with 0x0606060606060606ULL and see what happens (don't forget to reload the modules). -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
