Re: [Xen-users] Question on Xen schedulers

["Ulrich Windl" <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>]

On 13 Nov 2006 at 14:17, Schmidt Werner wrote:

> All,
>  
> following the announcements and recommendations since mid of this year 
> 'credit' is now the (only) recommended scheduler and the others ('bvt', 
> 'sedf') are already removed from the latest Xen 3.0 sources or will be 
> removed in the future.
> Now, 'credit' is designed for an optimum utilisation of a SMP system and may 
> be really the best scheduler for this purpose. But i think this is not the 
> only useful scenario for the usage of Xen; there maybe other scenarios with 
> other demands, e.g. soft real-time systems and/or single processor systems.
> If i remember correctly, one of the major advantages mentioned in the first 
> announcements of Xen 3.0 was the support of multiple schedulers (for 
> different purposes). Could give anyone the reasons why this approach is not 
> longer valid and what is the reason to kick out the already existing more 
> 'real-time friendly' schedulers, especially sedf ?

In SLES 10 that has XEN 3.0 the README of SEDF comes with the package, so I was 
assuming the scheduler was there. I haven't checked however. Is there a command 
to 
display the effective scheduler? ("xm info" does not)

Also the "xm" manual page says:

SCHEDULER SUBCOMMANDS
       Xen ships with a number of domain schedulers, which can be set at boot
       time with the sched= parameter on the Xen command line.  By default
       sedf is used for scheduling.


Ulrich


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