Weblog entry #209 for ajt
I upgraded my Debian 6.x KVM guests to 7.0 a few days before 7.0 was formally released. All went well and they were happy to run on a Debian KVM 6.x host. A few days after 7.0 had been released and I'd upgraded my desktop boxes I upgraded my home server. The the KVM problems began...
If I start a KVM guest it starts okay and is fine for a while but it is prone to consuming 100% of the host's CPU doing apparently nothing in the guest. Today I ran the guest and tools like rkhunter caused the host's CPU to hit 100%, but when rkhunter finishes the host's CPU still runs flat out. Within the guest the CPU is apparently idle...
In theory I could use cgroups to control this but Debian doesn't support hard limits, only soft ones. I would need to recompile the kernel with the right bits turned on to use hard limits. Apparently it's on in Fedora/Red Hat.
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