[Bug 703811] Re: kvm guest's cpu usage with virtio storage driver goes up to 100% because of flush process

Serge Hallyn 703811 at bugs.launchpad.net
Wed Feb 2 23:26:28 UTC 2011


I'm currently trying to reproduce this on a fully uptodate maverick
(no -updates) box.  I have 3 lucid vm's up, each of which started as
a server instance and is doing 'apt-get install openoffice.org' to
tax disk (and network).  I'm not getting the behavior you are seeing
though.

Each VM has its own 30G LVM volume for a root disk, and I'm running
each with:

	kvm -drive file=/dev/data/vm1,if=virtio,index=0,boot=on -m 1G -smp 2 -vnc :1
	kvm -drive file=/dev/data/vm2,if=virtio,index=0,boot=on -m 1G -smp 2 -vnc :2
	kvm -drive file=/dev/data/vm3,if=virtio,index=0,boot=on -m 1G -smp 2 -vnc :3

Of course at times each kvm process hits 100% of a cpu, but they're
absolutely not staying there, and I don't see anything like flush-252:0
even making it into 'top' results.

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https://bugs.launchpad.net/bugs/703811

Title:
  kvm guest's cpu usage with virtio storage driver goes up to 100%
  because of flush process



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