On Wed, Dec 23, 2009 at 1:59 PM, Avi Kivity <avi@xxxxxxxxxx> wrote: > On 12/23/2009 02:55 PM, Matthieu Olivier wrote: >> >> I can only see 4 cores in /proc/cpuinfo. >> According the caract page, there is no hyperthreading. >> >> -> http://ark.intel.com/Product.aspx?id=35130 >> >> > > In this case the plateau at 4 guests is perfectly understandable. > >> I also wonder why the host can still get more CPU ressources over 4 >> threads? I guess the purpose of both benchmarks is to overload the >> CPU, so why they can't reach the max? >> > > Probably a problem with the benchmark itself. > >> I suposed that the FPU was able to handle at least 2 operations the >> same time, or maybe hyperthreading was included, but I can't check the >> first part, and the second isn't true. >> >> Or maybe current x86 processors can handel very well these old >> benchmarks. I can't really say :/ >> > > No, you should see the same plateau as with kvm. The processor can't run > two threads at once. > > -- > error compiling committee.c: too many arguments to function > > I have this plateau with integer number tests in unixbench. I have it too with tests cache in cachebench. I am attempted to discard all nbench results, but each category (floating, integer and cache) is tested with 3 or 4 different tests, so the weight is more important. I'm facing a real dilemn. I'm going to inquire unixbench and nbench mainteners. I keep you in touch if I find something revealing. Thanks for your help Avi. -- Matthieu -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
