On Fri, May 08, 2009 at 10:55:37AM +0300, Avi Kivity wrote: > Marcelo Tosatti wrote: >> Also it would be interesting to see the MMIO comparison with EPT/NPT, >> it probably sucks much less than what you're seeing. >> > > Why would NPT improve mmio? If anything, it would be worse, since the > processor has to do the nested walk. > > Of course, these are newer machines, so the absolute results as well as > the difference will be smaller. Quad-Core AMD Opteron(tm) Processor 2358 SE 2.4GHz: NPT enabled: test 0: 3088633284634 - 3059375712321 = 29257572313 test 1: 3121754636397 - 3088633419760 = 33121216637 test 2: 3204666462763 - 3121754668573 = 82911794190 NPT disabled: test 0: 3638061646250 - 3609416811687 = 28644834563 test 1: 3669413430258 - 3638061771291 = 31351658967 test 2: 3736287253287 - 3669413463506 = 66873789781 -- 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
