Re: [PATCH v3 for Xen 4.6 1/4] xen: enable per-VCPU parameter settings for RTDS scheduler

[Dario Faggioli <dario.faggioli@citrix.com>]

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On Wed, 2015-07-08 at 18:16 -0700, Meng Xu wrote:
> 2015-07-08 1:33 GMT-07:00 Dario Faggioli <dario.faggioli@citrix.com>:
> > Well, wouldn't the above reasoning about overhead apply here too?
> > Budgets of 5us mean the scheduler can be invoked every 5us for budget
> > enforcement. If 10us was unreasonable, 5 is even more so.
> >
> > Therefore, 100us here too? Or maybe let's allow for lower values (like
> > 50us or 10us), but print a warning?
> 
> Right. we can use 100us as a threadhold for budget too. Maybe printing
> warning is a better idea?
> If users know what they are doing and expecting, it is ok. But too
> small value (<1us) will potentially cause system freeze.
> 
I'd be ok with printing a warning for vales below 100us, and rejecting
values below 1us, or even below 10us (I don't think it would be that
practical to go below that anyway).

Regards,
Dario
-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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