On Thu, Jan 19, 2012 at 10:14:53AM +0100, Jan Kiszka wrote: > On 2012-01-19 10:02, Gleb Natapov wrote: > > On Thu, Jan 19, 2012 at 09:35:47AM +0100, Jan Kiszka wrote: > >> Hi again, > >> > >> what is the best way to check if the TPR patching feature of qemu-kvm is > >> working and performs efficiently? I suppose Windows XP guests, e.g.? How > >> to measure this best? I'm about to start porting it to upstream and like > >> to prepare a good test case. > >> > > Run WindowsXP on AMD HW without vapic and see number of TPR access exits. > > Than run it with vapic and check again. Don't forget to check that > > reboot et al work. > > So is this an optimization only for AMD CPUs or can it be reproduced on > Intel as well? Any CPU feature dependencies? > It can be reproduced on Intel as well, but older once. There is flexpriority module option that you can disable on loading, but I think it is not enough and you also need to disable tpr_shadow, but there is not option for that. -- Gleb. -- 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
