Hi Satish, Since you already set "cpu_mode = host-passthrough", there's no need to set cpu_model. BTW, we're not known about the CPU topology a lot. But IME we always set "hw_cpu_sockets = 2" in specified image or flavor metadata if running Windows instance. In default, KVM always allocate all vcpus into sockets in CPU topology, and this will affect the Windows VM performance since Windows only support maximum 2 CPU sockets. Perhaps you can try limit socket numbers by setting hw_cpu_sockets in image metadata (or hw:cpu_sockets in flavor metadata.) Satish Patel <satish.txt@gmail.com> 於 2020年3月5日 週四 下午10:46寫道：
cpu_mode = cpu-passthrough cpu_model = none
Do you think cpu_model make difference ?
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On Mar 5, 2020, at 7:18 AM, Satish Patel<satish.txt@gmail.com> wrote:
cpu-passthrough
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On Mar 4, 2020, at 9:24 PM, rui zang <rui.zang@yandex.com> wrote:
Hi,
What is the value for the "cpu_mode" configuration option?
https://docs.openstack.org/mitaka/config-reference/compute/hypervisor-kvm.ht...
Thanks, Zang, Rui
05.03.2020, 01:24, "Satish Patel" <satish.txt@gmail.com>:
Folks,
We are running openstack with KVM and i have noticed kvm presenting wrong CPU Tolopoly to VM and because of that we are seeing bad performance to our application.
This is openstack compute:
# lstopo-no-graphics --no-io Machine (64GB total) NUMANode L#0 (P#0 32GB) + Package L#0 + L3 L#0 (25MB) L2 L#0 (256KB) + L1d L#0 (32KB) + L1i L#0 (32KB) + Core L#0 PU L#0 (P#0) PU L#1 (P#20) L2 L#1 (256KB) + L1d L#1 (32KB) + L1i L#1 (32KB) + Core L#1 PU L#2 (P#1) PU L#3 (P#21)
This is VM running on above compute
# lstopo-no-graphics --no-io Machine (59GB total) NUMANode L#0 (P#0 29GB) + Package L#0 + L3 L#0 (16MB) 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) L2 L#1 (4096KB) + Core L#1 L1d L#2 (32KB) + L1i L#2 (32KB) + PU L#2 (P#2) L1d L#3 (32KB) + L1i L#3 (32KB) + PU L#3 (P#3)
if you noticed P#0 and P#1 has own (32KB) cache per thread that is wrong presentation if you compare with physical CPU.
This is a screenshot of AWS vs Openstack CPU Topology and looking at openstack its presentation is little odd, is that normal?
I am running CentOS7.6 with kvm 2.12 version.