I've tried the kernel-lt with same results.
For kernel-ml, the baremetal wasn't able to boot at that time.
În mar., 23 aug. 2016 la 02:22, Adi Pircalabu <adi@xxxxxxxxxxx> a scris:
Laurentiu,
Just to chip in, without thoroughly checking the thread (which I'd like
to apologize in advance for): have you tried to test other kernel
instead of the stock one? You can have a look at
http://elrepo.org/tiki/kernel-ml and http://elrepo.org/tiki/kernel-lt
and use them for some comparison testing.
Cheers,
---
Adi Pircalabu
On 22-08-2016 18:31, Laurentiu Soica wrote:
> No luck with qemu-kvm-ev, the behavior is the same. Running perf
> record -a -g on the baremetal shows that most of the CPU time is in
> _raw_spin_lock
>
> Children Self Command Shared Object
> Symbol
> - 93.62%
> 93.62% qemu-kvm [kernel.kallsyms] [k]
> _raw_spin_lock
>
>
> - _raw_spin_lock
>
>
> + 45.30% kvm_mmu_sync_roots
>
>
> + 28.49% kvm_mmu_load
>
>
> + 25.00% mmu_free_roots
>
>
> + 1.12% tdp_page_fault
>
> În joi, 18 aug. 2016 la 11:59, Laurentiu Soica a
> scris:
>
>> I've tried with KSM disabled and nothing changed.
>>
>> I've upgraded KVM to qemu-kvm-ev. I'm waiting to see if there are
>> any improvements and report back.
>>
>> În mie., 17 aug. 2016 la 15:10, Boris Derzhavets
>> <bderzhavets@xxxxxxxxxxx> a scris:
>>
>> For myself KSM is unpredictable feature. The problem is Compute,
>> just this node
>>
>> does "copy on write" , so only Compute.
>>
>> My concern exactly is where would it lead to worse or better Guest
>> behavior ?
>>
>> I am not expecting complete fix. I would track via top/htop and
>> dmesg via Cron on 1-2 hr
>>
>> period.
>>
>> -------------------------
>>
>> FROM: centos-virt-bounces@xxxxxxxxxx
>> <centos-virt-bounces@xxxxxxxxxx> on behalf of Laurentiu Soica
>> <laurentiu@xxxxxxxx>
>>
>> SENT: Wednesday, August 17, 2016 6:38 AM
>>
>> TO: Discussion about the virtualization on CentOS
>> SUBJECT: Re: Nested KVM issue
>>
>> Both baremetal and compute ? Are there any other metrics do you
>> consider useful to collect for troubleshooting purposes ?
>>
>> În mie., 17 aug. 2016 la 13:04, Boris Derzhavets
>> a scris:
>>
>> It sounds weird, but attempt to disable KSM and see would it help or
>> no ?
>>
>> -------------------------
>>
>> FROM: centos-virt-bounces@xxxxxxxxxx
>> <centos-virt-bounces@xxxxxxxxxx> on behalf of Laurentiu Soica
>>
>> SENT: Wednesday, August 17, 2016 4:56 AM
>>
>> TO: Discussion about the virtualization on CentOS
>> SUBJECT: Re: Nested KVM issue
>>
>> Enabled the logging on both compute and baremetal. Nothing strange
>> in logs:
>>
>> on baremetal :
>>
>> Wed Aug 17 11:51:01 EEST 2016: committed 62310764 free 58501808
>> Wed Aug 17 11:51:01 EEST 2016: 87025667 < 123574516 and free >
>> 24714903, stop ksm
>>
>> on compute:
>>
>> Wed Aug 17 08:52:52 UTC 2016: committed 24547132 free 76730936
>> Wed Aug 17 08:52:52 UTC 2016: 45139624 < 102962460 and free >
>> 20592492, stop ksm
>>
>> and the compute node is again at 100% CPU utilization.
>>
>> În mar., 16 aug. 2016 la 15:26, Boris Derzhavets
>> a scris:
>>
>> I would enable ksmtuned logging ,if it has been done verify logs
>>
>> -------------------------
>>
>> FROM: centos-virt-bounces@xxxxxxxxxx
>> <centos-virt-bounces@xxxxxxxxxx> on behalf of Laurentiu Soica
>>
>> SENT: Tuesday, August 16, 2016 7:16 AM
>>
>> TO: Discussion about the virtualization on CentOS
>> SUBJECT: Re: Nested KVM issue
>>
>> Yes. It is on both baremetal and compute node.
>>
>> _______________________________________________
>> CentOS-virt mailing list
>> CentOS-virt@xxxxxxxxxx
>> https://lists.centos.org/mailman/listinfo/centos-virt
> _______________________________________________
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>
> --
>
> Laurentiu Soica
> _______________________________________________
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> CentOS-virt@xxxxxxxxxx
> https://lists.centos.org/mailman/listinfo/centos-virt
--
Laurentiu Soica
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