Sharon,

  All working ok now , thank you.

When is the prod release for rhv 4.2 due to come out do you know ?

Also I see migration for perf vm's won't be until version 4.3 , is there a rough timeline on that ?

   Regards

     Mark H.

---

From: Sharon Gratch <sgratch@redhat.com>
Sent: 15 November 2017 15:04
To: Mark Hunt
Subject: Re: ovirt 4.2 - performance vm

 

Hi Mark,

Thanks for the data you sent.

There was a bug avoiding High Performance VMs with NUMA node pining from start running (due to Null pointer exception, which is exactly what you encountered).

This bug was already fixed in latest oVirt engine master versions.

Can you please sync your engine to latest master version and re-check if problem is not reproduced anymore?

And regardless to that bug, just a small recommendation regarding the CPU pinning settings for your high performance VM 'perf' running on host euhpc-ovirt3.euhpc.arm.com:

For high performance results I recommend you to pin all 8 vCPUs and not just the first one.

i.e. CPU pinning topology field should be set to something like: 0#0_1#1_2#2_3#3_4#4_5#5_6#6_7#7

And then the NUMA pinning should be set accordingly, i.e. both vNUMAs 0, 1 should be pinned to host NUMA 0 instead of 0->1 and 1->0 (since CPUs 0-7 are part of NUMA 0).

Regards,

Sharon

On Tue, Nov 14, 2017 at 11:26 AM, Mark Hunt <Mark.Hunt@arm.com> wrote:

Hi Sharon,

Output from lscpu attached

  Regards

    Mark H.

---

From: Sharon Gratch <sgratch@redhat.com>
Sent: 13 November 2017 18:10
To: Mark Hunt
Subject: Re: ovirt 4.2 - performance vm

 

Hi,

Sorry for the late response.

It seems that NUMA pinning failed when running VM 'perf' on host: euhpc-ovirt3.euhpc.arm.com.

Because whenever you cancel the NUMA pinning, the VM runs without any error on this host.

But when you set the NUMA pinning, the VM failed to run on the host, then the scheduler tries to rerun the VM on other host in the cluster but there is no other host and that's why you get the error of "no available hosts".

So for having a full picture of the problem, can you please send me the NUMA settings of this host?

For that you just need to login to this host euhpc-ovirt3.euhpc.arm.com and run from shell:

>> lscpu

Can you please send me the result of this lscpu command?

Thanks,

Sharon

On Mon, Oct 30, 2017 at 12:50 PM, Mark Hunt <Mark.Hunt@arm.com> wrote:

Hi Sharon,

  Yes I did (numa + hp) , please find attached engine.log from the the ovirt manager vm. One thing I did note was that the first time I pinned the numa nodes they showed green in the gui , thereafter they were red !? 

      Regards

         Mark H.

---

From: Sharon Gratch <sgratch@redhat.com>
Sent: 24 October 2017 09:07
To: Mark Hunt
Subject: Re: ovirt 4.2 - performance vm

 

Hi,

Sorry for the late response.

Did you set huge-pages and/or NUMA pinning for this high-performance VM? If so then maybe no host was found with appropriate settings for running that VM.

Can you please send me the engine log with relevant errors/messages?

Thanks,

Sharon

On Fri, Oct 20, 2017 at 7:39 PM, Mark Hunt <Mark.Hunt@arm.com> wrote:

Hi Sharon,

  Is there anything not mentioned on the performance vm page that needs to be set for this to work ? I have tried starting one and all I get back is there are no available hosts - when there are !?

    Regards

      Mark H.

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