[Xen-devel] Question on xen schedulers

["Schmidt Werner" <Werner.Schmidt@xxxxxxxxxxxxxxxxx>]

All,
 

i had sent the mail below to xen-user mailing list before, but not got any helpful reaction. Probably it is really more a question for the xen-devel list; i would appreciate any useful  info on this topic:  

 

'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 ?
 
Thanks
 
Werner

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