* kvm exposing wrong CPU Topology to guest vm
@ 2020-03-02 20:12 Satish Patel
0 siblings, 0 replies; only message in thread
From: Satish Patel @ 2020-03-02 20:12 UTC (permalink / raw
To: kvm
Folks,
I am having major performance issue with my Erlang application running
on openstack KVM hypervisor and after so many test i found something
wrong with my KVM guest CPU Topology
This is KVM host - http://paste.openstack.org/show/790120/
This is KVM guest - http://paste.openstack.org/show/790121/
If you carefully observe output of both host and guest you can see
guest machine threads has own cache that is very strange
L2 L#0 (4096KB) + Core L#0
L1d L#0 (32KB) + L1i L#0 (32KB) + PU L#0 (P#0)
L1d L#1 (32KB) + L1i L#1 (32KB) + PU L#1 (P#1)
I believe because of that my erlang doesn't understand topology and
going crazy..
I have Ali Cloud and AWS and when i compare with them they are showing
correct CPU Topology the way physical machine showing, something is
wrong with my KVM look like.
I am running qemu-kvm-2.12 on centos 7.6 and i have tune my KVM at my
best level, like CPU vining, NUMA and cpu host-passthrough.
Thanks in advance for your help.
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