On Jan 15, 2008 10:34 PM, Jeremy C. Reed <[EMAIL PROTECTED]> wrote: > Any way to startup qemu with my own desired speed?
You can't as qemu emulated target speed is not constant. qemu generates code on-the-fly and uses optimizations that result in big variations. Add to that there's no cycle accuracy at all. > Bochs provides a CPU "IPS" (emulated Instructions Per Second) > configuration that can be adjusted to get at least close to the desired > speed. IIRC Bochs is an interpreted simulator so it can count instructions. Counting instructions is only a crude approximation as most processors have pipeline and caches. > I know that BogoMips is not a real benchmark, but the Linux system I am > running in qemu says it is at 7497.31 BogoMIPS which is the probably same > as if I booted the Linux system outside of qemu on same 1900Mhz hardware. > (I was hoping to see the BogoMips in the 200 to 700 range.) 7.4 BGIPS is an indicator that the bogo loop was very well optimized by qemu and/or the timer is wrong :-) Laurent
