Experts, We have been fighting with windows 2k8 64bit guest performance on virtual box linux host for about a week now. The behaviour we see is that the guest system slows down dramatically after running for a few hours.
We tried kernel upgrades on the host (up to 2.6.32.2 with 250 Hz and preempt) and different versions of Virtualbox (3.0.12 and 3.1.2, +franks timer patch). There were some differences, but the fact that the system slows down after some running time remained. So today I tried something new in order to make the whole business a bit more transparent. I got me an evaluation copy of PassMark (http://www.passmark.com/products/pt.htm) and ran it on virtualbox 3.0.12 (2 core 4GB ram win 2k8 64bit). I did two runs, one after the box had been running for 30 hours and the other one about 1 hour after reboot. The results are quite dramatic in places. The "CPU - String Sortging" test for example ran about 20 times slower after 30 hours of uptime. See http://tobi.oetiker.ch/test/vbox_slowdown.html (html) http://tobi.oetiker.ch/test/vbox_slowdown.png (graphics) for the complete results. I have not found any description as to what the passmark tests are doing 'exactly' but maybe the results do ring a bell with someone who knows vbox innards ... cheers tobi ps tonight we are going to move the virtual machines back to vmware server 1.0 since it has been working fine for about a month prior to us moving to virtual box (for more cpus and memory). -- Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland http://it.oetiker.ch t...@oetiker.ch ++41 62 775 9902 / sb: -9900 _______________________________________________ vbox-users mailing list vbox-users@virtualbox.org http://vbox.innotek.de/mailman/listinfo/vbox-users
