On 08.07.2011, at 04:55, Lê Đức Tài wrote: > On 30.06.2011, at 15:24, Alexander Graf <ag...@suse.de> wrote: > > > On 30.06.2011, at 04:11, Lê Đức Tài <letai_d...@yahoo.com.vn> wrote: > > > > > Thank for your answer. > > > Beside nbench, I'm also using Dhrystone to measure the guest cpu > > performance. > > > The performance does not much diffetence too. > > > Is the emulated guest performance not depend on guest processor clock? > > > > Please don't top-post. > > > > Qemu doesn't emulate cycle-accurately. Instead, it converts guest code to > > host code and executes it as fast as it can. So whatever you tell the > > > guest on the cpu speed doesn't really matter. Except for the timebase of > > course :). > > > > Mind if I ask what exactly you're trying to do with ppc emulation? I'm > > interested in use cases people have. > > > > Alex > > Thank you, > Exactly I want to emulate my ppc custom board (ppc440) with many features > supporting as Ethernet, HDD, VGA, .. for my test environment (I have a > software that running on ppc440). > And I wan to get the best performance of Qemu.
I see. Qemu always gives you "best performance", as it can't throttle the guest :). Btw, I'd be happy to merge your custom board (or at least some components of it if they are reasonably mainstream) upstream, if you think it makes sense and the code is in good shape. Alex
