[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-API] Low CPU benchmark performance on PV VM
Hi Xen-community, I am running a CPU benchmark tool (LINPACK) on a PV VM inside Xen 4.5.1 on Ubuntu 15.10 x64 on a IBM x3550 M4 server. This tool should consume all possible CPU cycles available. I allocate 4 vCPUs by defining this in the Xen PV (test.cfg). However, only 1 core and 4 threads are used: CPU frequency: 2.494 GHz Number of CPUs: 1 Number of cores: 1 Number of threads: 4 This is what lscpu says inside this Xen PV VM: Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 4 Core(s) per socket: 1 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 62 Model name: Intel(R) Xeon(R) CPU E5-2609 v2 @ 2.50GHz Stepping: 4 CPU MHz: 2500.062 BogoMIPS: 5000.12 Hypervisor vendor: Xen Virtualization type: full L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 10240K NUMA node0 CPU(s): 0-3 A HVM VM DO get all possible cores allocated inside the virtual node (see below). These nodes have significant better performance then the Xen PV virtual node. CPU frequency: 2.494 GHz Number of CPUs: 1 Number of cores: 4 Number of threads: 4 This is the DomU Xen host machine lscpu: lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 8 On-line CPU(s) list: 0-7 Thread(s) per core: 1 Core(s) per socket: 4 Socket(s): 2 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 62 Model name: Intel(R) Xeon(R) CPU E5-2609 v2 @ 2.50GHz Stepping: 4 CPU MHz: 2500.062 BogoMIPS: 5000.12 Hypervisor vendor: Xen Virtualization type: none L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 10240K NUMA node0 CPU(s): 0-7 Xen vCPU list: xl vcpu-list Domain-0 0 0 7 -b- 10.1 all / all Domain-0 0 1 2 -b- 6.5 all / all Domain-0 0 2 4 r-- 2.6 all / all Domain-0 0 3 0 r-- 3.9 all / all Domain-0 0 4 3 -b- 4.4 all / all Domain-0 0 5 6 -b- 2.6 all / all Domain-0 0 6 5 -b- 4.7 all / all Domain-0 0 7 7 -b- 2.9 all / all test 3 0 1 -b- 1.5 0-3 / all test 3 1 0 -b- 1.8 0-3 / all test 3 2 0 -b- 0.7 0-3 / all test 3 3 2 -b- 0.6 0-3 / all xen DomU PV VM config: cat test.cfg bootloader = '/usr/lib/xen-4.5/bin/pygrub' vcpus = '4' memory = '2048' cpus = "0-3" Is there any options to give the paravirtualized guest the host-cpu topology? In other words, how do I get Xen to use more vCPU cores? Thanks! _______________________________________________ Xen-api mailing list Xen-api@xxxxxxxxxxxxx http://lists.xen.org/cgi-bin/mailman/listinfo/xen-api
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