[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] 2 DomU and 2 4-cores CPU
Hi,Xen has different CPU schedulers. The default is the credit scheduler - this is a "fair" scheduler. Here cou can read more about it: http://wiki.xensource.com/xenwiki/CreditScheduler Mit freundlichen Gruessen / Best Regards Michael SchmidtAm 09.04.10 09:09, schrieb L.M.J: On Fri, 02 Apr 2010 10:29:53 +0200, Michael Schmidt <michael.schmidt@xxxxxxxxxx> wrote:Hi, you can assign all DomUs all cores. In the case of 100% utilization of both DomUs, the xen-scheduler provides 50% CPU time from all the CPUs for each DomU. If one DomU idles and the other one, need 100% CPU, it will get the power of all the 8 Cores.Thanks Michael for your fast reply. I would like to share what I've heard from Vmware : when you assigned 4 CPU to a VM, Vmware wait to have 4 cores free at the same time before give them to the VM which could slow down your VM instead of speed up. Is there the same issue with Xen ?L.M.J schrieb:Hi, With my college, I was wondering what is the best optimization for our setup. I've got 2 VM with 16GB of RAM and 4 vCPU to each one. My server got 2 CPU with 4 cores inside (makes 8 CPU). What produce the best performance : 1) Give ALL cpu to my 2 VM and each ones will take its 4 vCPU where itcan2) Give CPU 0-3 to VM1 and CPU 4-7 to VM2 : each vm own the 4 coresfrom 1 CPU3) Give CPU 0,1,4,5 to VM1 and 2,3,6,7 to VM2 : mix cores between theboth CPUThanks by advance for any information or point me to any docs talkingabout this ! _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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