title: qemu vs qemu-kvm: some performance measurements
body: <p>I conducted the following benchmark in qemu and qemu-kvm, with the following configuration:</p>
  
  <pre><code>CPU: AMD 4400 process dual core with svm enabled, 2G RAM
  Host OS: OpenSUSE 11.3 with latest Patch, running with kde4
  Guest OS: FreeDos
  Emulated Memory: 256M
  Network: Nil
  Language: Turbo C 2.0
  Benchmark Program: Count from 0000000 to 9999999. Display the counter on the screen
       by direct accessing the screen memory (i.e. 0xb800:xxxx)
  </code></pre>
  
  <p>It only takes 6 sec when running in qemu.</p>
  
  <p>But it takes 89 sec when running in qemu-kvm.</p>
  
  <p>I ran the benchmark one by one, not in parallel.</p>
  
  <p>I scratched my head the whole night, but still not idea why this happens. Would somebody give me some hints?</p>