Red Hat Bugzilla – Bug 1479448
vm boot very slowly running with vhost-user when cpuset is configured
Last modified: 2017-09-25 09:23:31 EDT
=== Description ===
We saw VM booting very slowly with the following two settings in the guest config file:
It seems this problem happened on 4.11.0-17.el7a.aarch64 kernel, but not with kernel 4.11.0-10.el7a.aarch64. We also found that, at least on arm1 (a Gigabyte machine owned by network team) machine, lower index of physical cores (e.g. 6, 7, 8, 9) will cause the problem. But a larger index numbers allow VM to boot successfully.
==== Setting Details ====
<vcpu placement='static' cpuset='6-9'>4</vcpu>
<vcpupin vcpu='0' cpuset='6'/>
<vcpupin vcpu='1' cpuset='7'/>
<vcpupin vcpu='2' cpuset='8'/>
<vcpupin vcpu='3' cpuset='9'/>
2. vhost user
<source type='unix' path='/usr/local/var/run/openvswitch/vhost1' mode='client'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
We haven't seen this problem after a clean installation on failed machines. I am cc'ing the original reporter. If he can confirm that it has be resolved, we can close this BZ.
Yes, this has cleared up and I have not seen it again.