Open Stack

cpu_mode = cpu-passthrough 
cpu_model = none

Do you think cpu_model make difference ?


Sent from my iPhone

> On Mar 5, 2020, at 7:18 AM, Satish Patel<satish.txt at gmail.com> wrote:
> 
> 
> 
> cpu-passthrough 
> 
> Sent from my iPhone
> 
>>> On Mar 4, 2020, at 9:24 PM, rui zang <rui.zang at yandex.com> wrote:
>>> 
>> 
>> Hi,
>>  
>> What is the value for the "cpu_mode" configuration option?
>> https://docs.openstack.org/mitaka/config-reference/compute/hypervisor-kvm.html
>>  
>> Thanks,
>> Zang, Rui
>>  
>>  
>> 05.03.2020, 01:24, "Satish Patel" <satish.txt at 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?
>> 
>> https://imgur.com/a/2sPwJVC
>> 
>> I am running CentOS7.6 with kvm 2.12 version.
>>  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-discuss/attachments/20200305/0164f22e/attachment.html>