Re: [Xen-devel] [PATCH v2 0/5] Towards work-conserving RTDS

[Andrii Anisov <andrii_anisov@xxxxxxxx>]

Hello Meng Xu and Dario,

On 01.09.17 18:58, Meng Xu wrote:
> This series of patches make RTDS scheduler work-conserving
> without breaking real-time guarantees.
> VCPUs with extratime flag set can get extra time
> from the unreserved system resource.
> System administrators can decide which VCPUs have extratime flag set.
As I understand from threads and the code, the work conserving algorithm 
is quite simplistic and will prefer a vcpu with greater utilization.
From our side we are looking for a bit different solution. I.e., in the 
same cpupool, running vcpus eager for RT characteristics under EDF 
conditions, and share the rest of resources between non-rt vcpus (i.e. 
in a credit manner).
Possible use-case could be a system with a domain hunger for resources, 
but not critical (some infotainment system) and an RT domain utilizing 
at most 20% of a single CPU core. Having a SoC with 4 cores, 
partitioning would be a significant resources wasting for described 
scenario.
How feasible is it from your point of view?

BTW, are you targeting XEN 4.10 with this patch series?

--

*Andrii Anisov*



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