On 07/17/2012 05:59 PM, zxq9 wrote: > On 07/18/2012 07:46 AM, Orion Poplawski wrote: >> On 07/17/2012 04:17 PM, zxq9 wrote: >>> On 07/18/2012 06:55 AM, Orion Poplawski wrote: >>>> While staring at top on my kvm server waiting for it to crash, I noticed >>>> that my idle Fedora kvm guests appear to be consuming between 8-12% cpu >>>> while my idle SL6 guests appear to be consuming between 0.3-2% cpu as >>>> shown in the qemu-kvm processes in top. >>>> >>>> Does anyone have any insight as to why this would be the case? >>> >>> That depends heavily on what version of Fedora they are (particularly >>> Rawhide >>> instances), and what services they are running. >> >> Well, I have a Fedora 17 instance running now with nothing but kernel >> processes and the qemu-kvm process still shows using 7-8% cpu. > > There's pretty much no such thing as a F17 instance with nothing but the > kernel running. Can you log in to one of the instances and check what top says > is running (like the top 10 or so processes by CPU use)? > Not at that point, because I'd killed everything but the kernel and systemd :) > The odds that kvm itself is spinning more just to keep F17 alive over anything > else is remote, but the odds that something in F17 defaults to wasteful > behavior is quite high (particularly if you are hosting X with Gnome Shell -- > there are any number of things that waste cycles in there). > > That said, you may be affected by the Fedora version of the July 1st leap > second bug where processes like qpidd eat 1 core (or equivalent) entirely > while stuck in an infinite loop (this behavior can survive a reboot). If you > see a single process in top eating a significant percentage of its allocated > resources try: > > date; date $(date +"%m%d%H%M%C%y.%S"); date > > on the misbehaving Fedora instance and see if things change. There are no busy processes. Load avg is at or less than 0.05. -- Orion Poplawski Technical Manager 303-415-9701 x222 NWRA, Boulder Office FAX: 303-415-9702 3380 Mitchell Lane [log in to unmask] Boulder, CO 80301 http://www.nwra.com