Re: [Xen-devel] credit vs sedf scheduler

[marek cervenka <cervajs@xxxxxxxxxx>]

> Keir already addressed the SEDF question. I think soft real
> time support is a desirable thing. If you actually look at
> what the SEDF scheduler does though, it's not always obeying
> the administrator's orders or doing a very efficient job with
> simple workloads.
>
> It would be interesting to compare scheduler traces with your
> SEDF setup and the credit scheduler and see if, how, and why
> SEDF might be scheduling things better for you.
>
> There are certainly simple things we could do in credit to
> improve soft real time guarantees if needed:
> - make the system default time slice tuneable.
> - make per domain time-slice tuneable
> - introduce strict priority based scheduling (like the current
>  I/O boost but tuneable per domain by the admin)
> - Use the strict priority mechanism to offer soft real time
>  time-slice and wake-to-run latency best effort guarantees.
vote for soft real time support
i have 10-20 domU on single P4+HT (asterisk, freeswitch, openser, 
openpbx,..)
I/O is low


---------------------------------------
Marek Cervenka
=======================================


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