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Posted to users@cloudstack.apache.org by Stefan Beigel <be...@gmail.com> on 2016/11/30 21:29:53 UTC
vm use more cpu than restricted [kvm]
Hi,
I'am using cloudstack with a small scale deployment and the following
configuration:
cloudstack version: 4.8
hosts:
- cpu: 2x 2400 mhz
- memory: 4GB
- os: ubuntu 14.04 64 bit
vm:
- cpu: 1x 500 mhz
- memory: 500 mb
- os: ubuntu 14.04 64 bit
I tried some tests and when I utilize the vm to 100% the host gets utilize
to 50%.
So one vm with 500 mhz gets 2400 mhz from the hosts.
Is this normal or a bug?
I enabled the "cpu cap" option for the used service offering.
Hope someone can Help.
Greets Stefan
Re: vm use more cpu than restricted [kvm]
Posted by Stefan Beigel <be...@gmail.com>.
Hallo Simon
This is the xml file of the virtual machine.
greets Stefan
<domain type='kvm' id='7'>
<name>i-4-118-VM</name>
<uuid>0c795c99-5bab-46f8-a321-71e3e398036b</uuid>
<description>Ubuntu 14.04 (64-bit)</description>
<memory unit='KiB'>512000</memory>
<currentMemory unit='KiB'>512000</currentMemory>
<vcpu placement='static'>1</vcpu>
<cputune>
<shares>500</shares>
</cputune>
<resource>
<partition>/machine</partition>
</resource>
<sysinfo type='smbios'>
<system>
<entry name='manufacturer'>Apache Software Foundation</entry>
<entry name='product'>CloudStack KVM Hypervisor</entry>
<entry name='uuid'>0c795c99-5bab-46f8-a321-71e3e398036b</entry>
</system>
</sysinfo>
<os>
<type arch='x86_64' machine='pc-i440fx-trusty'>hvm</type>
<boot dev='cdrom'/>
<boot dev='hd'/>
<smbios mode='sysinfo'/>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<cpu>
</cpu>
<clock offset='utc'>
<timer name='kvmclock'/>
</clock>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/kvm-spice</emulator>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source
file='/mnt/a5bb6304-61f7-3d9e-9706-1f447a6a5fdb/af0c4ab6-aaad-4990-9046-da6ac83a575f'/>
<target dev='vda' bus='virtio'/>
<serial>af0c4ab6aaad49909046</serial>
<alias name='virtio-disk0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</disk>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw' cache='none'/>
<target dev='hdc' bus='ide'/>
<readonly/>
<alias name='ide0-1-0'/>
<address type='drive' controller='0' bus='1' target='0' unit='0'/>
</disk>
<controller type='usb' index='0'>
<alias name='usb0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'>
<alias name='pci.0'/>
</controller>
<controller type='ide' index='0'>
<alias name='ide0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01'
function='0x1'/>
</controller>
<interface type='bridge'>
<mac address='06:0b:00:00:00:15'/>
<source bridge='cloudbr0'/>
<bandwidth>
<inbound average='25600' peak='25600'/>
<outbound average='25600' peak='25600'/>
</bandwidth>
<target dev='vnet8'/>
<model type='virtio'/>
<alias name='net0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
<serial type='pty'>
<source path='/dev/pts/4'/>
<target port='0'/>
<alias name='serial0'/>
</serial>
<console type='pty' tty='/dev/pts/4'>
<source path='/dev/pts/4'/>
<target type='serial' port='0'/>
<alias name='serial0'/>
</console>
<input type='tablet' bus='usb'>
<alias name='input0'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='5903' autoport='yes' listen='10.0.0.11'>
<listen type='address' address='10.0.0.11'/>
</graphics>
<video>
<model type='cirrus' vram='9216' heads='1'/>
<alias name='video0'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x02'
function='0x0'/>
</video>
<memballoon model='none'>
<alias name='balloon0'/>
</memballoon>
</devices>
<seclabel type='none'/>
</domain>
2016-12-01 2:14 GMT+01:00 Simon Weller <sw...@ena.com>:
> Hi Stefan,
>
>
> This sounds very odd.
>
>
> Can you do a virsh dumpxml <vdomainid from virsh list> on the host so we
> can see what configuration has been written to the xml configuration?
>
>
> Thanks,
>
>
> Simon
>
>
> ________________________________
> From: Stefan Beigel <be...@gmail.com>
> Sent: Wednesday, November 30, 2016 3:29 PM
> To: users@cloudstack.apache.org
> Subject: vm use more cpu than restricted [kvm]
>
> Hi,
>
> I'am using cloudstack with a small scale deployment and the following
> configuration:
>
> cloudstack version: 4.8
>
> hosts:
> - cpu: 2x 2400 mhz
> - memory: 4GB
> - os: ubuntu 14.04 64 bit
>
> vm:
> - cpu: 1x 500 mhz
> - memory: 500 mb
> - os: ubuntu 14.04 64 bit
>
> I tried some tests and when I utilize the vm to 100% the host gets utilize
> to 50%.
> So one vm with 500 mhz gets 2400 mhz from the hosts.
> Is this normal or a bug?
> I enabled the "cpu cap" option for the used service offering.
>
> Hope someone can Help.
> Greets Stefan
>
Re: vm use more cpu than restricted [kvm]
Posted by Simon Weller <sw...@ena.com>.
Hi Stefan,
This sounds very odd.
Can you do a virsh dumpxml <vdomainid from virsh list> on the host so we can see what configuration has been written to the xml configuration?
Thanks,
Simon
________________________________
From: Stefan Beigel <be...@gmail.com>
Sent: Wednesday, November 30, 2016 3:29 PM
To: users@cloudstack.apache.org
Subject: vm use more cpu than restricted [kvm]
Hi,
I'am using cloudstack with a small scale deployment and the following
configuration:
cloudstack version: 4.8
hosts:
- cpu: 2x 2400 mhz
- memory: 4GB
- os: ubuntu 14.04 64 bit
vm:
- cpu: 1x 500 mhz
- memory: 500 mb
- os: ubuntu 14.04 64 bit
I tried some tests and when I utilize the vm to 100% the host gets utilize
to 50%.
So one vm with 500 mhz gets 2400 mhz from the hosts.
Is this normal or a bug?
I enabled the "cpu cap" option for the used service offering.
Hope someone can Help.
Greets Stefan
Re: vm use more cpu than restricted [kvm]
Posted by Linas Žilinskas <li...@host1plus.com>.
cpu cap has no effect on kvm afaik.
the VM will always be allowed to get the max speed, but the cpu shares
are calculated based on the set speed, so a vm with a speed of 500mhz
will have less cpu shares than a vm with 1000mhz. This means that if
noone is using the cpu enough, everyone is allowed to use it to the max.
But if multiple vm's have high cpu usage, the one with speed of 1000mhz
will have the higher priority.
On 2016-11-30 21:29, Stefan Beigel wrote:
> Hi,
>
> I'am using cloudstack with a small scale deployment and the following
> configuration:
>
> cloudstack version: 4.8
>
> hosts:
> - cpu: 2x 2400 mhz
> - memory: 4GB
> - os: ubuntu 14.04 64 bit
>
> vm:
> - cpu: 1x 500 mhz
> - memory: 500 mb
> - os: ubuntu 14.04 64 bit
>
> I tried some tests and when I utilize the vm to 100% the host gets utilize
> to 50%.
> So one vm with 500 mhz gets 2400 mhz from the hosts.
> Is this normal or a bug?
> I enabled the "cpu cap" option for the used service offering.
>
> Hope someone can Help.
> Greets Stefan
>
Linas \u017dilinskas
Head of Development
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