On Tue, Feb 23, 2021 at 4:10 PM Lavi.Buchnik--- via Users
wrote:
> Hi,
>
> We have a strange thing, which not clear to us.
> When provisioning a new VM via REST API, if the number of vCPU for that VM
> is more than 16, I'm getting this error:
>
> Fault reason is "Operation Failed". Fault detail is "[Cannot add VM.
> Maximum number of threads per cpu exceeded]". HTTP response code is 409.
>
> Our version is: Version 4.3.6.6-1.0.9.el7
>
> Note that manual provisioning from the UI do not produce any error when
> using vCPU > 16.
> It seems like the issue is related to this setting (from the engine):
>
> [root@olvmengine01 ~]# engine-config -g MaxNumOfThreadsPerCpu
> MaxNumOfThreadsPerCpu: 8 version: 4.1
> MaxNumOfThreadsPerCpu: 8 version: 4.2
> MaxNumOfThreadsPerCpu: 8 version: 4.3
> [root@olvmengine01 ~]#
>
> But when trying to set it to another number, I'm always get this error,
> for example:
>
> [root@olvmengine01 ~]# engine-config -s MaxNumOfThreadsPerCpu=10
> Please select a version:
> 1. 4.1
> 2. 4.2
> 3. 4.3
> 3
> Cannot set value 10 to key MaxNumOfThreadsPerCpu.
>
> Questions:
> 1. Can you please explain why we getting this error: "Cannot add VM.
> Maximum number of threads per cpu exceeded"?
>
You've specified a value for threads-per-core that exceeds the
MaxNumOfThreadsPerCpu limit.
2. Is it related to engine-config -g MaxNumOfThreadsPerCpu?
>
Yes
> 3. Why it is working manually via the UI?
>
The UI sets the CPU topology for you when you specify the number of vCPUs
(for 16, it produces #sockets = 16, #cores=1, #threads=1).
> 4. if its related to engine-config, why we can't set it to another number?
>
You can change the values that engine-config accepts for
MaxNumOfThreadsPerCpu by changing MaxNumOfThreadsPerCpu.validValues in
/etc/ovirt-engine/engine-config/engine-config.properties but I think it
would be better to specify a better CPU topology in the request..
>
> Thanks in advance,
> Lavi
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