Hi all, A little update,
so yea when I run with tasks that has utilization less than 0.5. Xen-RTDS is able to complete all those tasks. Thank you guys very much for helping me understand the problem! On Tue, Dec 1, 2015 at 2:11 AM, Lars Kurth <lars.kurth....@gmail.com> wrote: > I wonder whether we need to add some health warnings and recommended > background reading to http://wiki.xenproject.org/wiki/RTDS-Based-Scheduler > Lars > > > On 1 Dec 2015, at 08:59, Dario Faggioli <dario.faggi...@citrix.com> > wrote: > > > > On Sun, 2015-11-29 at 11:44 -0500, Meng Xu wrote: > >> 2015-11-29 11:27 GMT-05:00 Dario Faggioli <dario.faggi...@citrix.com> > >> : > >>> > >>> Mmmm... As I said many times, I don't remember much of all those RT > >>> schedulability formulas, but, is really that simple? > >> > >> Ah, let me clarify... > >> It is not that simple. ;-) I just simplify it, hoping it can simplify > >> the problem and highlight the possible reason. > >> > > Ok, glad to know I haven't completely lost my mind, or anything like > > that! :-) > > > >>> I mean, if the in- > >>> guest scheduling algorithm is global (e.g., global-EDF), the task > >>> could > >>> migrate, couldn't it? > >> > >> Yes. If these partial VCPUs happen to be scheduled "sequentially", > >> the > >> OS inside VM can migrate the task and make the task keep running. But > >> that is not the worst-case for the OS. > >> > > Right, I see it now, and (FWIW) I absolutely agree with the worst-case > > analysis you provided (thanks). I did not get the fact that you were > > talking about the worst-case, sorry for the noise. :-D > > > >> The detailed illustration of the worst case scenario is at Arvind's > >> paper: http://link.springer.com/article/10.1007%2Fs11241-009-9073-x > >> My latest journal paper > >> (http://link.springer.com/article/10.1007%2Fs11241-015-9223-2) > >> tighten > >> the resource supply bound function of the MPR model. I believe the > >> equations are too boring to most of people in the mailing list. > >> > >> So let's avoid the complex equations here. ;-) > >> > > Thanks for this too! :-) > > > > Regards, > > Dario > > -- > > <<This happens because I choose it to happen!>> (Raistlin Majere) > > ----------------------------------------------------------------- > > Dario Faggioli, Ph.D, http://about.me/dario.faggioli > > Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK) > > > > _______________________________________________ > > Xen-devel mailing list > > Xen-devel@lists.xen.org > > http://lists.xen.org/xen-devel > >
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