On Thu, Oct 12, 2017 at 01:23:36PM +0200, Michał Koc wrote:
On Sun, Oct 08, 2017 at 11:59:52PM +0200, Oliver Marugg wrote:
On 7 Oct 2017, at 22:01, Mike Larkin wrote:
On Sat, Oct 07, 2017 at 02:19:58PM +0200, Oliver Marugg wrote:
Just to add a 4th situation of hangs: Login via proxmox (pve)/kvm
serial
console (via noVNC), login successful: Vm guest in pve hangs, cpu
usage at
above 102%. Only way is to hard stop the Vm guest. -oliver
sounds like a kvm bug. Ask your provider to investigate the host side
when this
happens.
Thanks Mike, will do so. The proxmox guys have also the idea that it could
be a bug in kvm hypervisor (which is the hypervisor part for proxmox) and
will affect OpenBSD since 4.9, they wrote me in their public forum. As far
as I understood they do not know what OpenBSD needs in kvm or what/where
should be fixed in kvm run OpenBSD without that freezes.
-oliver
>From what I read, the cpu spins to 100%, which means somewhere on the host it's
likely spinning also. Start with systrace/ptrace/ktrace/whatever on the host
qemu-kvm and go from there...
-ml
Hi,
it looks like the cpu process of kvm (CPU 0/KVM) is issuing 1500+ of
ioctl(15, KVM_RUN, 0) per second while running OpenBSD 6.2 guest.
What CPU profile is being presented to the OpenBSD guest?
I've seen things like this happen when a vCPU is claimed to have monitor/mwait
support, but the hypervisor implements those as NOPs, which just results in
spinning like this.
In short - try changing the type of CPU presented to the guest and see if that
changes behaviour. At least then you'll have more data points to work with.
-ml
Okey,
How would You disable monitor/mwait support in KVM to be presented to
guest ?
changing CPU to pentium or setting <feature policy='disable'
name='monitor'/> does not actually change anything in scope of host cpu
utilization....
BR
M.K.
In case of linux guest the process issues about 15 of those ioctls per
second.
In any case I cannot make openbsd to starve KVM host cpu. OpenBSD uses at
most(when idle) 7% of cpu.
My versions:
- OpenBSD 6.2 amd64
- KVM 2.8.1
BR
M.K.
