On Sat, 5 May 2012 15:31:36 +0100 Anup Patel <anup at brainfault.org> wrote: > Hi PMM, > > Also in my-view even if we have in-kernel emulation of irqchip and timer still Xvisor ARM will be performing better than KVM ARM because amount of code path traversed in KVM ARM will always be more. > > (Please note my-view about in-kernel emulation is totally based on code flow comparison of Xvisor ARM emulation and possible KVM ARM in-kernel emulation) > Sweet. Can I borrow your crystal ball? M. > On Sat, May 5, 2012 at 7:54 PM, Anup Patel <anup at brainfault.org<mailto:anup at brainfault.org>> wrote: > Hi PMM, > > I agree we cannot predict real world performance based on performance on ARM fast models but if system A is performing better than system B no ARM fast model or QEMU then in real world system A will perform better than system B. Of-course in real world scale of difference in performance between system A and system B will differ. > > The previous announcement only proves that Xvisor ARM is relatively better than KVM ARM. > > Regards, > --Anup > > > On Sat, May 5, 2012 at 3:36 PM, Peter Maydell <peter.maydell at linaro.org<mailto:peter.maydell at linaro.org>> wrote: > 2012/5/5 Anup Patel <anup at brainfault.org<mailto:anup at brainfault.org>>: > > This announcement is to show an apple to apple performance comparison > > between Xvisor ARM and KVM ARM running on VExpress-A15 Fast Model. > > I would strongly caution against trying to do any performance/timing > type tests if you're still running on the ARM Fast Model -- they are > not representative of performance characteristics on hardware > and you really can't draw any conclusions about real world > performance by timing things on a model. It's quite easy to get > into a situation where all you're measuring is "does my code happen > to do a lot of some perfectly reasonable operation which happens > to be hard and slow to implement for the model?". > > (Also, KVM for ARM is still under development and we haven't > yet made several of the obvious performance improvements like > in-kernel irqchip and timer support, so it's not really a very > useful thing to compare against yet.) > > -- PMM > > -- I'm the slime oozin' out from your TV set...
