[Bug 503138] Re: after kernel message hrtimer: interrupt too slow.... the kvm guest becomes slow [possible solution found!]

[Ferdinand Hagethorn]

Okay, time for an update:

Host: Now running Ubuntu Natty 11.04 x86_64 on an AMD Phenom II x4 955 platform, linux-image-server as kernel
Guests: 2x Ubuntu 10.04 LTS x86_64, 1x Ubuntu LTS 10.04 32bit i686, all three systems use linux-image-virtual as kernel (issue occurs on all other installable kernels, - pae, -generic)

If I use >1 CPU for the kvm guests, the hrtimer appears in the dmesg and
the systems slow to a crawl. When I only assign 1 CPU to the guests the
issue does not occur.

This but has been known since sept 2009 and SMP guests are unusable
because of this, is anyone looking into this?


** Summary changed:

- after kernel message  hrtimer: interrupt too slow.... the kvm guest becomes slow [possible solution found!]
+ after kernel message  hrtimer: interrupt too slow.... the SMP(!) kvm guest becomes slow.

** Package changed: linux (Ubuntu) => kvm (Ubuntu)

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https://bugs.launchpad.net/bugs/503138

Title:
  Lucid & Natty, KVM, After kernel message  hrtimer: interrupt too
  slow.... the SMP kvm guest becomes slow.

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