1:37 a.m.
Hi,
Seems this question is not related with libvirt directly, but I still want to ping this
list to see if someone can be help.
The OS in my desktop box is Ubuntu 12.10, the kernel is 3.5.1. I installed the cgroup
utility package with:#apt-get install cgroup-bin, but after I installed these packages
successfully, I can't find cpu_quota/cpu_period controller in the /sys/fs/cgroup/cpu
folder. So the essential question is:
What I need to do to make cgroup can support CFS BWC feature? Specifically, how to make
the cpu_quota/cpu_period to be available within cgroup/cpu?
BRs,
Dennis
9:04 a.m.
On 12/14/2012 12:37 AM, Dennis Chen wrote:
Hi,
Seems this question is not related with libvirt directly, but I still want to ping this
list to see if someone can be help.
The OS in my desktop box is Ubuntu 12.10, the kernel is 3.5.1. I installed the cgroup
utility package with:#apt-get install cgroup-bin, but after I installed these packages
successfully, I can't find cpu_quota/cpu_period controller in the /sys/fs/cgroup/cpu
folder. So the essential question is:
What I need to do to make cgroup can support CFS BWC feature?
Your kernel sounds new enough, and since you have cgroups turned on,
libvirt should just be able to use it. Did you restart libvirtd after
turning on cgroups?
Specifically, how to make the cpu_quota/cpu_period to be available
within cgroup/cpu?
Have you tried using the libvirt XML markings that control cpu quota and
period? If so, it either works (you have everything you need), or else
it would be helpful if you posted the error message you get when trying.
For reference, the XML to use is documented at:
http://libvirt.org/formatdomain.html#elementsCPUTuning
and you can also do hot-plug modifications by using virsh schedinfo.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
9:15 p.m.
On 12/14/2012 11:04 PM, Eric Blake wrote:
On 12/14/2012 12:37 AM, Dennis Chen wrote:
> Hi,
>
> Seems this question is not related with libvirt directly, but I still want to ping
this list to see if someone can be help.
>
> The OS in my desktop box is Ubuntu 12.10, the kernel is 3.5.1. I installed the cgroup
utility package with:#apt-get install cgroup-bin, but after I installed these packages
successfully, I can't find cpu_quota/cpu_period controller in the /sys/fs/cgroup/cpu
folder. So the essential question is:
>
> What I need to do to make cgroup can support CFS BWC feature?
Your kernel sounds new enough, and since you have cgroups turned on,
libvirt should just be able to use it. Did you restart libvirtd after
turning on cgroups?
I tried restart the libvirtd but seems this approach is not effective...
> Specifically, how to make the cpu_quota/cpu_period to be
available within cgroup/cpu?
Have you tried using the libvirt XML markings that control cpu quota
and period? If so, it either works (you have everything you need), or
else it would be helpful if you posted the error message you get when trying.
For reference, the XML to use is documented at:
http://libvirt.org/formatdomain.html#elementsCPUTuning
and you can also do hot-plug modifications by using virsh schedinfo.
Yes, I tried. Below is the error info when I tried to start the vm with the
modified xml file:
virsh # create /etc/libvirt/qemu/odm.xml
error: Failed to create domain from /etc/libvirt/qemu/odm.xml
error: Unable to get cpu bandwidth period: No such file or directory
As the hot-plug method, the virsh will complain:
virsh # schedinfo odm --set cpu_period=1000000
Scheduler : posix
error: invalid scheduler option: cpu_period=1000000
So I think the root cause is no cpu_period/quota in my installed cgroup folder.
Interesting, I remembered a couple of weeks ago, I had an older Linux distribution
installed, the cpu_period/quota is there.
BRs,
Dennis
3:03 a.m.
HI,
I am trying to develop an application on windows which would connect to
the hypervisor using libvirt.I am trying to analyse libvirt statically.I
was able to figure out the list of APIs that should be used to connect to
the hypervisor....But unable to make out the sequence of calls to be
invoked to create a new virtual machine(domain)....Can some one pls help me
out in this...
Thanks in advance...
Venkat
4:40 p.m.
On 12/18/2012 02:03 AM, Sasidhar Khambhampati wrote:
HI,
I am trying to develop an application on windows which would connect to
the hypervisor using libvirt.I am trying to analyse libvirt statically.I
was able to figure out the list of APIs that should be used to connect to
the hypervisor....But unable to make out the sequence of calls to be
invoked to create a new virtual machine(domain)....Can some one pls help me
out in this...
Did you mean to attach this to an unrelated thread? In general, when
asking a new question, it's best to start a new thread instead of
replying to a random message.
Have you looked at any of the code examples that ship as part of
libvirt? For example:
http://libvirt.org/git/?p=libvirt.git;a=blob;f=examples/hellolibvirt/hell...
Or more detailed, the source code for virsh is a great reference for how
to use almost all of the libvirt APIs (but not quite as simple to follow).
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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4 comments
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Sasidhar Khambhampati