On 11/18/2010 04:01 PM, Kenni Lund wrote: >> Do you have a rule of thumb as to how many core to assign >> to a guest? For instance, with an Intel x5650 with 6 real >> and 12 hyperthreaded cores, how many cores would you assign >> to the guest? > > It fully depends on the load of your guests and how many guests you > want/need to run on a single server. > > You need to perform some testing to know what will work the best in > your case. One thing to remember though: In your case, if you create > two guests with 12 virtual CPUs each, and one of them crashes and take > all its 12 virtual CPUs up to 100%, it will essentially take most of > the processing power away from the second guest, leaving the second > guest in a close-to-useless state (depending on your scheduler, but > you get the point). If you on the other hand had assigned 6 cores to > each of them, the second guest would have remained unaffected, since > it just uses the 6 cores with no load. So if your guest will not > utilize the extra CPUs anyway, then don't assign them. > > Best regards > Kenni Thank you! -T