I've managed to following Jivings answer to set up QEMU on my Ubuntu machine with the default Debian image, though I have had to use arm1136-r2 instead of arm1176.

What is the best way to compare the speed the emulated processor is running at?

Doing a cat /proc/cpuinfo gives me BogoMIPS = 135.57. This was on a Intel Atom @1.6 GHz, no KVM.

How does this relate to an actual Raspberry Pi?

  • I'm guessing you don't mean the contents of /proc/cpuinfo but actually the raw number of instructions per second?
    – Jivings
    Commented Jun 15, 2012 at 7:24

2 Answers 2


On my Pi, cat /proc/cpuinfo gives me:

pi@raspberrypi:~$ cat /proc/cpuinfo
Processor       : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS        : 697.95
Features        : swp half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xb76
CPU revision    : 7

Mathematica, which is available now for the Rpi, has a benchmarking tool. One example is to calculate a discrete fourier transform. I timed the operation five times each on an RPi and Qemu-RPi on a Xeon 6-core Windows 64-bit system and obtained the following:

  • RPi 5.55s (0.7% variability)
  • Qemu 12.9 (1.4% variability)

So it looks like the emulator is taking a roughly 50% speed hit under these conditions.

For those interested, here is the Mathematica code I ran:


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.