similar to: Centos 7 newer kernel needed

Hello Xlord, The CPU does have VT support and I already have the nested KVM enabled. Checking the Linux Kernel release notes I saw that the nested kvm feature was implemented in 3.10 but he EPT support is in 3.12. So Centos 7's kernel which is 3.10 does have the EPT support? Is there a way to check that the EPT support is available in the kernel? Thank you, Laurentiu On Thu, Aug 4, 2016,

Hi Xlord, Yes, the CPU has support for EPT. I wrongly thought that the nested EPT was first introduced in 3.12. Following your instructions I see that I have it enabled on my system as well. However, checking the kernel commits from 3.12 on search string 'nested ept' I found about 10 code changes/fixes for nested EPT.

Dear Laurentiu, Agree with Johnny for kernel upgrade if upgrade helps, alternative if 3.10 or above already supported it, you can check from kernel parameter or options if they are disabled on purpose. You can do that via the "make menuconfig" via "https://wiki.centos.org/HowTos/I_need_the_Kernel_Source" or "https://wiki.centos.org/HowTos/BuildingKernelModules". Hope

Dear Laurentiu, Could you please check if your CPU supported from /proc/cpuinfo and lscpu ? EPT supported Xlord From: -=X.L.O.R.D=- [mailto:xlord.sl at gmail.com] Sent: Thursday, August 4, 2016 5:12 PM To: 'Laurentiu Soica' <laurentiu at soica.ro>; 'Discussion about the virtualization on CentOS' <centos-virt at centos.org> Subject: RE: [CentOS-virt] Centos 7

________________________________ From: centos-virt-bounces at centos.org <centos-virt-bounces at centos.org> on behalf of Laurentiu Soica <laurentiu at soica.ro> Sent: Sunday, August 14, 2016 10:17 AM To: Discussion about the virtualization on CentOS Subject: Re: [CentOS-virt] Nested KVM issue More details on the subject: I suppose it is a nested KVM issue because it raised after I

Dear Laurentiu, Please check below info since assume your CentOS7 box CPU processor already VT supported in advance. 1) Checkpoint #1: Hardware and Kernel modules a. cat /proc/cpuinfo | grep vmx b. cat /sys/module/kvm_intel/parameters/nested (if ?N? then go to checkpoint #2) 2) Checkpoint #2: Assume your CentOS box support a. echo 'options kvm-intel nested=y'

Reports posted look good for me. Config should provide the best available performance for cloud VM (L2) on Compute Node. 1. Please, remind me what goes wrong from your standpoint ? 2. Which CPU is installed on Compute Node && how much RAM ? Actually , my concern is :- Number_of_ Cloud_VMs versus Number_CPU_Cores ( not threads) Please, check `top` report in

I would attempt to decrease number of VCPUS allocated to cloud VMs. Say try 4 => 2 . My guess there is not enough VCPUs to run OS itself. I also guess CPU model << Haswell. Please , confirm ( or not) if possible. Since Haswell was launched via my experience Intel Xeons based on this kernel (or latter kernels ) behaves much better then SandyBridge or IvyBridge based. Boris.

It sounds weird, but attempt to disable KSM and see would it help or no ? ________________________________ From: centos-virt-bounces at centos.org <centos-virt-bounces at centos.org> on behalf of Laurentiu Soica <laurentiu at soica.ro> Sent: Wednesday, August 17, 2016 4:56 AM To: Discussion about the virtualization on CentOS Subject: Re: [CentOS-virt] Nested KVM issue Enabled the

I would enable ksmtuned logging ,if it has been done verify logs ________________________________ From: centos-virt-bounces at centos.org <centos-virt-bounces at centos.org> on behalf of Laurentiu Soica <laurentiu at soica.ro> Sent: Tuesday, August 16, 2016 7:16 AM To: Discussion about the virtualization on CentOS Subject: Re: [CentOS-virt] Nested KVM issue Yes. It is on both

Is KSM enabled on your Compute Nodes ( presuming CentOS 7.2 on bare metal ) ? ________________________________ From: centos-virt-bounces at centos.org <centos-virt-bounces at centos.org> on behalf of Laurentiu Soica <laurentiu at soica.ro> Sent: Tuesday, August 16, 2016 5:25 AM To: Discussion about the virtualization on CentOS Subject: Re: [CentOS-virt] Nested KVM issue Running the

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 at centos.org

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%

Sorry, How you trigger the problem ? B. ________________________________ From: centos-virt-bounces at centos.org <centos-virt-bounces at centos.org> on behalf of Laurentiu Soica <laurentiu at soica.ro> Sent: Tuesday, August 16, 2016 3:28 AM To: Discussion about the virtualization on CentOS Subject: Re: [CentOS-virt] Nested KVM issue Hello, The issue reproduced again and it

Hello, I have an OpenStack setup in virtual environment on CentOS 7. The baremetal has *nested KVM* enabled and 1 compute node as a VM. Inside the compute node I have multiple VMs running. After about every 3 days the VMs get inaccessible and the compute node reports high CPU usage. The qemu-kvm process for each VM inside the compute node reports full CPU usage. Please help me with some hints

So basically you're saying that this THP feature is broken for CentOS 7 ? The feature is enabled by default. Is there a thread opened on this issue ? ?n mie., 24 aug. 2016 la 18:13, <m.roth at 5-cent.us> a scris: > Laurentiu Soica wrote: > > Hello, > > > > I have a CentOS 7 installation on baremetal with 2 CPUs, 10 cores each > and > > HT enabled, 128 GB

Hello, I have a CentOS 7 installation on baremetal with 2 CPUs, 10 cores each and HT enabled, 128 GB RAM. The system has transparent hugetables enabled. cat /sys/kernel/mm/transparent_hugepage/enabled [always] madvise never The system reports anonymous hugepages pages usage and a size of hugepage of 2048Kb cat /proc/meminfo |grep -i hugepages|grep AnonHugePages AnonHugePages: 35491840 kB

On 08/04/2016 07:30 AM, Laurentiu Soica wrote: > Hi Xlord, > > Yes, the CPU has support for EPT. > > I wrongly thought that the nested EPT was first introduced in 3.12. > Following your instructions I see that I have it enabled on my system as > well. > > However, checking the kernel commits from 3.12 on search string 'nested > ept' I found about 10

Hi, I have a 2 nodes ocfs2 cluster running UEK 2.6.32-100.0.19.el5, ocfs2console-1.6.3-2.el5, ocfs2-tools-1.6.3-2.el5. My problem is that all the time when i try to run /etc/init.d/o2cb stop it fails with this error: Stopping O2CB cluster CLUSTER: Failed Unable to stop cluster as heartbeat region still active There is no active mount point. I tried to manually stop the heartdbeat with

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