[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] unfair VCPU scheduling: slow HVM guest boot
Hi, Launch a HVM guest with twice as many VCPUs as physical CPUs are in the machine. You will notice the guest boots slow. With xentop you see, the first VCPU is rarely scheduled once the other VCPUs are up in the guest. If the boot process is just waiting for the first VCPU to finish something (e.g. handling an interrupt), then the whole boot process "freezes" until the first VCPU gets scheduled. Here is an xentop line showing how unfair the VCPUs are scheduled: VCPUs(sec): 0: 44s 1: 94s 2: 96s 3: 140s Christoph -- AMD Saxony, Dresden, Germany Operating System Research Center Legal Information: AMD Saxony Limited Liability Company & Co. KG Sitz (Geschäftsanschrift): Wilschdorfer Landstr. 101, 01109 Dresden, Deutschland Registergericht Dresden: HRA 4896 vertretungsberechtigter Komplementär: AMD Saxony LLC (Sitz Wilmington, Delaware, USA) Geschäftsführer der AMD Saxony LLC: Dr. Hans-R. Deppe, Thomas McCoy _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
|
![]() |
Lists.xenproject.org is hosted with RackSpace, monitoring our |