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I'm running KVM with libvirt for 2 years now. But I have a strange issue since a few months. The host machine runs out of memory and swap which causes kernel panic. My host machine (Ubuntu 10.10 x64) has 8gb memory and 2gb swap. I run 3 guests on this machine with the following memory settings:
- Guest 1: max and current usage: 2gb.
- Guest 2: max and current usage: 2gb.
- Guest 3: max 3gb and current usage: 2gb.
Total max. usage by guest: 7gb.
KVM/Libvirt version info
Compiled against library: libvir 0.9.0
Using library: libvir 0.9.0
Using API: QEMU 0.9.0
Running hypervisor: QEMU 0.14.0
When all guests are under high load the systeem may run out of memory (once or twice a month). I checked the memory usage from time to time: the KVM the process of Guest 3 uses more than 3gb (4.1gb is the max. I have seen). How is this possible?
The actual memory usage for each VM is slightly larger than the requested size. qemu-kvm VMs run about 20-25 percent more memory than the requested size on my systems. Reduce the amount of memory for each VM using that formula and that should solve the memory over commit issue.
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