10-15% iowait on kvm instances on Ubuntu 14.04

[William Van Hevelingen]

Hi All,

Does anyone know about any known issues with KVM on Ubuntu Trusty?

We're seeing 10-15% iowait on some instances that are essentially idling.
Two different hypervisors are showing the same symptoms. We had no issues
when we were running them on Precise with less powerful machines.

We're using the paravirtual drivers for the instances disk_type.


# uname -a
Linux kvm-andromeda 3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:00:20 UTC
2014 x86_64 x86_64 x86_64 GNU/Linux

# kvm --version
QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.1), Copyright (c)
2003-2008 Fabrice Bellard


-- 
Thanks,
William Van Hevelingen
Portland State University
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