Re: [Xen-users] how to change Xen scheduler and enable the XM-FLASK in case Xen is not compiled from the source?

[Sarah Newman <srn@xxxxxxxxx>]

On 7/11/19 6:10 AM, tee as wrote:
> Hello everyone,
> first, i am new to xen so maybe my questions might sound uninteresting but
> i am still learning :). I have installed xen using this method:
> https://wiki.xenproject.org/wiki/Xen_Project_Beginners_Guide  and not
> compiling it from the source (i tried multiple times but i got errors while
> compiling the kernel). To change the scheduler, I read that i have to pass
> this command sched=credit2 to the hypervisor at boottime and to enable
> FLASK i have to modify  .config file and set XSM_ENABLE and FLASK_ENABLE to
> "y"
> My questions are :
> - Is there a difference between the method i used for installing xen and
> compiling it fromn the sources?  I did not compile xen in the method i
> used.
Modifying the .config file only makes a difference when compiling from source. 
This describes the purpose of .config if you want to understand more:

https://www.linuxjournal.com/content/kbuild-linux-kernel-build-system

flask is almost certainly not enabled already, but you should be able to check 
for support by running 'sudo xl flask'.


> - How to change the scheduler and enable XM-FLASK, while i am using the
> installation in the link?
credit2 is supposedly the default in some versions, such as 4.12 for example.

https://xenbits.xenproject.org/docs/4.12-testing/features/sched_credit2.html

You can check the current scheduler by looking at 'xen_scheduler' in the output 
of 'sudo xl info'.
If the scheduler is not sched2, assuming you're using Debian, look at 
https://wiki.debian.org/Xen#Other_configuration_tweaks

> - In case this is not possible, can anyone guide me on how to instal it
> from the source and give me the right kernel?
If you already have a distribution kernel that works with Xen, you should be 
able to use it as-is.

For Xen, try

https://wiki.xenproject.org/wiki/Compiling_Xen_From_Source

and let us know.

--Sarah

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