[Xen-users] Unable to instantiate additional guest domains

[Vittorio Cozzolino <vittorio.cozzolino@xxxxxxxxx>]

Hi,

I'm currently running some stress tests to figure out how many PVs I can 
squeeze into my server with Xen. The machine has 64 vcpus (32 physical) 
and 128 GB RAM. My Domain-0 has 8 vcpus dedicated to it.
My basic PV VM is a Linux Alpine DomU with the following settings:


# DomU settings
memory = 512
name = "tiny_alpine_51"
vcpus = 2
maxvcpus = 2

I have reached the point where I have 50 PV of this kind booted and 
ready. If I try to add more guests domains I receive the following error:

libxl: error: libxl_dom.c:301:libxl__build_pre: Couldn't set max vcpu count
libxl: error: libxl_create.c:1142:domcreate_rebuild_done: cannot 
(re-)build domain: -3
libxl: error: libxl.c:1591:libxl__destroy_domid: non-existant domain 650
libxl: error: libxl.c:1549:domain_destroy_callback: unable to destroy 
guest with domid 650
libxl: error: libxl.c:1476:domain_destroy_cb: destruction of domain 650 
failed
Can anyone help me understand the reason behind such message (machine 
limit reached?) or how to tune my XEN hypervisor and avoid it?
Best regards,
Vittorio



--
Vittorio Cozzolino, M.Eng.
Technische Universität München - Institut für Informatik
Office 01.05.051
Boltzmannstr. 3, 85748 Garching, Germany
Tel: +49 89 289-17356
http://www.cm.in.tum.de/en/research-group/vittorio-cozzolino

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