Libvirt

[Marko Horn]

so,
cause eBPF pulls all from the kernel,
yes you can.
but you need to dive into the stuff..
Knowing basics about performance and kernel can help.
but it's possible.

slainte!

----------------------------------------

26.12.2022 19:19:47 Gk Gk <ygk.kmr at gmail.com>:

> So, can I derive cpu, memory, disk and network stats of the VMs ?
> 
> On Monday, December 26, 2022, Marko Horn <weber at zbfmail.de> wrote:
>> Hello,
>>
>> yes I can :-)
>>
>> https://www.brendangregg.com/
>>
>> on the page you will find a link to his 'Linux Performance' book.
>> On the page are also further Infos about the topic 'performance'.
>> you will have to dive into the stuff.
>> (e)BPF is a "MIGHTY" area.
>> But you can pull out nearly 'every' meta data from the kernel.
>>
>> Also for your interest:
>>
>> https://www.brendangregg.com/Slides/SREcon2022_ComputingPerformance/
>>
>> Computing Performance 2022 and what is on the horizon!
>>
>> have fun!
>>
>> Slainte
>>
>> ________________________________
>>
>> 26.12.2022 18:09:39 Gk Gk <ygk.kmr at gmail.com>:
>>
>> Thanks Marco for the response. Is it possible to collect these vm stats from the host KVM hypervisor ? Also can u give the link for this book ?
>>
>> Thanks
>> Happy holidays
>>
>> On Monday, December 26, 2022, Marko Horn <weber at zbfmail.de> wrote:
>>> Hi,
>>>
>>> I think best way is to use BPF to collect stats. I did this in past in combination with 'perf'.
>>> Theres a nice book of Brandon Greg from Netflix Networks where he describe how to do this and how to write own scripts.
>>>
>>> merry Xmas
>>>
>>> marko
>>>
>>> ________________________________
>>>
>>> 26.12.2022 11:34:20 Gk Gk <ygk.kmr at gmail.com>:
>>>
>>> Hi All,
>>> I am trying to collect memory, disk and network stats for a VM on kvm host. It seems that the statistics are not matching what the OS inside the VM is reporting. Why is this discrepancy ?
>>> Is this a known bug of libvirt ? Also I heard that libvirt shows cumulative figures for these measures ever since the VM was created.  Also I tested by creating a new vm and comparing the stats without a reboot . Even in this case, the stats dont agree.  Can someone help me here please ?
>>>
>>> Thanks
>>> Kumar
>>>
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