Tagged Questions
5
votes
1answer
496 views
KVM/Qemu, Ubuntu: Why do more guests CPUs enhance Disk-I/O rapidly?
We have an Heartbeat/DRBD/Pacemaker/KVM/Qemu/libvirt cluster consisting of two nodes.
Each node runs Ubuntu 12.04 64 Bit with the following packages/versions:
Kernel 3.2.0-32-generic #51-Ubuntu SMP
...
1
vote
1answer
147 views
How to limit excessive CPU usage from guest OS in KVM
On Xen it is easy as we have CreditScheduler [1], so on a machine with each guest OS sharing only portion of CPU, e.g. 6 guests running on top of a dual core CPU, excessive CPU usage is prohibited.
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1
vote
1answer
194 views
kvm - cpu cores are disabling and enabling in a loop
On our virtualisation server with KVM, cpu cores are disabling and enabling in a loop after 10 minutes (every disable results in 15 seconds hang for all virtual machines).
It happens from ...
5
votes
3answers
7k views
KVM: Which CPU features make VMs run better?
We are using Ubuntu 12.04 with the following parameters:
Dell R910
Kernel 3.2.0-25-generic #40-Ubuntu SMP x86_64 x86_64 x86_64 GNU/Linux
kvm 1:84+dfsg-0ubuntu16+1.0+noroms+0ubuntu13
qemu-kvm ...
5
votes
2answers
937 views
kvm and qemu host: Is there a limit for max CPUs (Ubuntu 10.04)?
Today we encountered a really strange behaviour on two identical kvm and qemu hosts (Dell R910).
The host systems each have 4 x 10 Cores, which means that 40 physical cores are displayed as 80 within ...
1
vote
3answers
331 views
Cgroups vs Tasksets in KVM
I have a CentOS 6 host for several KVM VMs with FreeBSD as guest.
I want to bind each VM to use no more than one core at once. What would you suggest to use, Cgroups or Tasksets?
2
votes
2answers
2k views
KVM and virtual to physical CPU mapping
I'm a relative late comer to the virtualistion party, so you'll have to forgive me if this seems like an obvious question.
If I have a server with 12 cores available, does each KVM guest have access ...
3
votes
4answers
5k views
Virtualized CPU cores vs. threads
We've got a KVM host system on Ubuntu 9.10 with a newer Quad-core Xeon CPU with hyperthreading. As detailed on Intel's product page, the processor has 4 cores but 8 threads. /proc/cpuinfo and htop ...
