xenpm and scheduler

xenpm and scheduler

[tutu sky]

hi,
Does xenpm 'cpufreq' or 'cpuidle' feature, has any effect on scheduling decisions?
thanks a lot.

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Re: xenpm and scheduler

[Meng Xu]

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On Mon, Apr 11, 2016 at 10:16 AM, tutu sky <ooohooo_u@hotmail.com> wrote:

>
> hi,
> Does xenpm 'cpufreq' or 'cpuidle' feature, has any effect on scheduling
> decisions?
>

​Please do not cross post.

No effect on RTDS scheduler.

May I ask a question: why do you need to consider this?

Thanks,

Meng
-- 
-----------
Meng Xu
PhD Student in Computer and Information Science
University of Pennsylvania
http://www.cis.upenn.edu/~mengxu/

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Re: xenpm and scheduler

[tutu sky]

Thanks Xu. I will do as desired about cross messaging.

i need it because i exactly want to know that which part of the scheduler's corde (credit), takes effect from this feature. because it is important to me knowing that where would be trade off between idle state and doing load balancing, while cpuidle feature is activated. in other side it's important again for me that what will happen for 'cap; and 'weight' decreasing in a case that one core's frequency is lower than another one in the same socket (actually when cpufreq feature is enable).

Am i clear enough? can you give me an answer or maybe some lines of schedule.c or sched_credit.c's code which i can track them to notice the effect of xenpm on scheduler part of the view?

Thanks a lot.  
Regards.




From: Meng Xu <xumengpanda@gmail.com>
Sent: Monday, April 11, 2016 12:11 PM
To: tutu sky
Cc: Xen-devel@lists.xen.org
Subject: Re: [Xen-devel] xenpm and scheduler
  






On Mon, Apr 11, 2016 at 10:16 AM, tutu sky  <ooohooo_u@hotmail.com> wrote:

hi,
Does xenpm 'cpufreq' or 'cpuidle' feature, has any effect on scheduling decisions?




​Please do not cross post. 


 

No effect on RTDS scheduler. 


 

May I ask a question: why do you need to consider this? 


 

Thanks, 


 

Meng   -- 

-----------
Meng Xu
PhD Student in Computer and Information Science
University of Pennsylvania
http://www.cis.upenn.edu/~mengxu/      
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: xenpm and scheduler

[Dario Faggioli]

[-- Attachment #1.1: Type: text/plain, Size: 1811 bytes --]

On Tue, 2016-04-12 at 03:52 +0000, tutu sky wrote:
> Thanks Xu. I will do as desired about cross messaging.
> 
> i need it because i exactly want to know that which part of the
> scheduler's corde (credit), takes effect from this feature. because
> it is important to me knowing that where would be trade off between
> idle state and doing load balancing, while cpuidle feature is
> activated. in other side it's important again for me that what will
> happen for 'cap; and 'weight' decreasing in a case that one core's
> frequency is lower than another one in the same socket (actually when
> cpufreq feature is enable).
> 
Currently, there is no interaction between the scheduler and the power
management and frequency scaling layers.

> Am i clear enough? can you give me an answer or maybe some lines of
> schedule.c or sched_credit.c's code which i can track them to notice
> the effect of xenpm on scheduler part of the view?
> 
If you're saying that, for instance, the CPUs changing frequency can or
should affect some aspects of the scheduling algorithms (like credits
burning rate in Credit1 and Credit2, and budget burning rate in RTDS),
that is an interesting point which may indeed make sense, or at least
would deserve more investigation.

But again, right now, there's no line of code to read to understand the
relationship, as there's no relationship at all.

If you want to experiment on playing with xenpm, and seeing what effect
it has on scheduling, that will be very welcome. :-)

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)


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Re: xenpm and scheduler

[tutu sky]

Thanks Dario,
Yeah, I do like playing with xenpm and try understanding relationship between this and scheduler. but i established a xen environment on vmware, but xenpm does not work correctly and even for 'cpufreq', it is silent at all! so it does not let me try to play with :(. I asked this problem before in the user and devel lists both,  but no body answered me. how can i track the problem, from who (I know that power management is out of your maintenance scope)?? (may xenpm have the same problem on a real platform (again) instead of vmware?)
thanks a lot.
regards.
________________________________________
From: Dario Faggioli <dario.faggioli@citrix.com>
Sent: Tuesday, April 12, 2016 8:10 AM
To: tutu sky; Meng Xu
Cc: Xen-devel@lists.xen.org
Subject: Re: [Xen-devel] xenpm and scheduler

On Tue, 2016-04-12 at 03:52 +0000, tutu sky wrote:
> Thanks Xu. I will do as desired about cross messaging.
>
> i need it because i exactly want to know that which part of the
> scheduler's corde (credit), takes effect from this feature. because
> it is important to me knowing that where would be trade off between
> idle state and doing load balancing, while cpuidle feature is
> activated. in other side it's important again for me that what will
> happen for 'cap; and 'weight' decreasing in a case that one core's
> frequency is lower than another one in the same socket (actually when
> cpufreq feature is enable).
>
Currently, there is no interaction between the scheduler and the power
management and frequency scaling layers.

> Am i clear enough? can you give me an answer or maybe some lines of
> schedule.c or sched_credit.c's code which i can track them to notice
> the effect of xenpm on scheduler part of the view?
>
If you're saying that, for instance, the CPUs changing frequency can or
should affect some aspects of the scheduling algorithms (like credits
burning rate in Credit1 and Credit2, and budget burning rate in RTDS),
that is an interesting point which may indeed make sense, or at least
would deserve more investigation.

But again, right now, there's no line of code to read to understand the
relationship, as there's no relationship at all.

If you want to experiment on playing with xenpm, and seeing what effect
it has on scheduling, that will be very welcome. :-)

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

Re: xenpm and scheduler

[Konrad Rzeszutek Wilk]

On Tue, Apr 12, 2016 at 11:50:42AM +0000, tutu sky wrote:
> Thanks Dario,
> Yeah, I do like playing with xenpm and try understanding relationship between this and scheduler. but i established a xen environment on vmware, but xenpm does not work correctly and even for 'cpufreq', it is silent at all! so it does not let me try to play with :(. I asked this problem before in the user and devel lists both,  but no body answered me. how can i track the problem, from who (I know that power management is out of your maintenance scope)?? (may xenpm have the same problem on a real platform (again) instead of vmware?)
> thanks a lot.

You will have to.

I don't believe VMWare exposes C and P states to guests so therefore
there is no power freqeuency in play.

> regards.
> ________________________________________
> From: Dario Faggioli <dario.faggioli@citrix.com>
> Sent: Tuesday, April 12, 2016 8:10 AM
> To: tutu sky; Meng Xu
> Cc: Xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] xenpm and scheduler
> 
> On Tue, 2016-04-12 at 03:52 +0000, tutu sky wrote:
> > Thanks Xu. I will do as desired about cross messaging.
> >
> > i need it because i exactly want to know that which part of the
> > scheduler's corde (credit), takes effect from this feature. because
> > it is important to me knowing that where would be trade off between
> > idle state and doing load balancing, while cpuidle feature is
> > activated. in other side it's important again for me that what will
> > happen for 'cap; and 'weight' decreasing in a case that one core's
> > frequency is lower than another one in the same socket (actually when
> > cpufreq feature is enable).
> >
> Currently, there is no interaction between the scheduler and the power
> management and frequency scaling layers.
> 
> > Am i clear enough? can you give me an answer or maybe some lines of
> > schedule.c or sched_credit.c's code which i can track them to notice
> > the effect of xenpm on scheduler part of the view?
> >
> If you're saying that, for instance, the CPUs changing frequency can or
> should affect some aspects of the scheduling algorithms (like credits
> burning rate in Credit1 and Credit2, and budget burning rate in RTDS),
> that is an interesting point which may indeed make sense, or at least
> would deserve more investigation.
> 
> But again, right now, there's no line of code to read to understand the
> relationship, as there's no relationship at all.
> 
> If you want to experiment on playing with xenpm, and seeing what effect
> it has on scheduling, that will be very welcome. :-)
> 
> 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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Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: xenpm and scheduler

[tutu sky]

Thanks Konrad. I will do :)
Yeah, I believe so. as i can see that there is not any bios settings for power management in there (vmware).  I hope you be the correct party which i want to ask this question: there is a tutorial here in this page:
1) http://xenserver.org/partners/developing-products-for-xenserver/19-dev-help/138-xs-dev-perf-turbo.html

which i know as a quick guide for establishing xenpm. my Q is that, are this page and this two page of xen.wiki below enough for establishing xenpm and make it work totally?

2) http://wiki.xenproject.org/wiki/Xenpm_command
3) http://wiki.xenproject.org/wiki/Xen_power_management

 if yes, there is a problem, when i compiled xen from source, there is not any xensource folder in /opt folder in dom0 to follow the instructions in (1) address. i did all those instructions in dom0 config file instead.

if these guides are not enough in your point of view too, i think (just as a suggestion), xenpm needs more documentation, in order to clarify it's activation and usage progress. it remains a silent area in this giant project although is quiet usable.

thanks and regards.

________________________________________
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Sent: Tuesday, April 12, 2016 1:41 PM
To: tutu sky
Cc: Dario Faggioli; Meng Xu; Xen-devel@lists.xen.org
Subject: Re: [Xen-devel] xenpm and scheduler

On Tue, Apr 12, 2016 at 11:50:42AM +0000, tutu sky wrote:
> Thanks Dario,
> Yeah, I do like playing with xenpm and try understanding relationship between this and scheduler. but i established a xen environment on vmware, but xenpm does not work correctly and even for 'cpufreq', it is silent at all! so it does not let me try to play with :(. I asked this problem before in the user and devel lists both,  but no body answered me. how can i track the problem, from who (I know that power management is out of your maintenance scope)?? (may xenpm have the same problem on a real platform (again) instead of vmware?)
> thanks a lot.

You will have to.

I don't believe VMWare exposes C and P states to guests so therefore
there is no power freqeuency in play.

> regards.
> ________________________________________
> From: Dario Faggioli <dario.faggioli@citrix.com>
> Sent: Tuesday, April 12, 2016 8:10 AM
> To: tutu sky; Meng Xu
> Cc: Xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] xenpm and scheduler
>
> On Tue, 2016-04-12 at 03:52 +0000, tutu sky wrote:
> > Thanks Xu. I will do as desired about cross messaging.
> >
> > i need it because i exactly want to know that which part of the
> > scheduler's corde (credit), takes effect from this feature. because
> > it is important to me knowing that where would be trade off between
> > idle state and doing load balancing, while cpuidle feature is
> > activated. in other side it's important again for me that what will
> > happen for 'cap; and 'weight' decreasing in a case that one core's
> > frequency is lower than another one in the same socket (actually when
> > cpufreq feature is enable).
> >
> Currently, there is no interaction between the scheduler and the power
> management and frequency scaling layers.
>
> > Am i clear enough? can you give me an answer or maybe some lines of
> > schedule.c or sched_credit.c's code which i can track them to notice
> > the effect of xenpm on scheduler part of the view?
> >
> If you're saying that, for instance, the CPUs changing frequency can or
> should affect some aspects of the scheduling algorithms (like credits
> burning rate in Credit1 and Credit2, and budget burning rate in RTDS),
> that is an interesting point which may indeed make sense, or at least
> would deserve more investigation.
>
> But again, right now, there's no line of code to read to understand the
> relationship, as there's no relationship at all.
>
> If you want to experiment on playing with xenpm, and seeing what effect
> it has on scheduling, that will be very welcome. :-)
>
> 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
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: xenpm and scheduler

[Konrad Rzeszutek Wilk]

On Tue, Apr 12, 2016 at 05:04:04PM +0000, tutu sky wrote:
> Thanks Konrad. I will do :)
> Yeah, I believe so. as i can see that there is not any bios settings for power management in there (vmware).  I hope you be the correct party which i want to ask this question: there is a tutorial here in this page:
> 1) http://xenserver.org/partners/developing-products-for-xenserver/19-dev-help/138-xs-dev-perf-turbo.html
> 
> which i know as a quick guide for establishing xenpm. my Q is that, are this page and this two page of xen.wiki below enough for establishing xenpm and make it work totally?
> 
> 2) http://wiki.xenproject.org/wiki/Xenpm_command
> 3) http://wiki.xenproject.org/wiki/Xen_power_management
> 
>  if yes, there is a problem, when i compiled xen from source, there is not any xensource folder in /opt folder in dom0 to follow the instructions in (1) address. i did all those instructions in dom0 config file instead.

Xen source != XenServer.


> 
> if these guides are not enough in your point of view too, i think (just as a suggestion), xenpm needs more documentation, in order to clarify it's activation and usage progress. it remains a silent area in this giant project although is quiet usable.
>

If you run 'xenpm' by itself it gives you the options.

Patches to make an manpage for xenpm are always warmly welcome!
> thanks and regards.
> 
> ________________________________________
> From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Sent: Tuesday, April 12, 2016 1:41 PM
> To: tutu sky
> Cc: Dario Faggioli; Meng Xu; Xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] xenpm and scheduler
> 
> On Tue, Apr 12, 2016 at 11:50:42AM +0000, tutu sky wrote:
> > Thanks Dario,
> > Yeah, I do like playing with xenpm and try understanding relationship between this and scheduler. but i established a xen environment on vmware, but xenpm does not work correctly and even for 'cpufreq', it is silent at all! so it does not let me try to play with :(. I asked this problem before in the user and devel lists both,  but no body answered me. how can i track the problem, from who (I know that power management is out of your maintenance scope)?? (may xenpm have the same problem on a real platform (again) instead of vmware?)
> > thanks a lot.
> 
> You will have to.
> 
> I don't believe VMWare exposes C and P states to guests so therefore
> there is no power freqeuency in play.
> 
> > regards.
> > ________________________________________
> > From: Dario Faggioli <dario.faggioli@citrix.com>
> > Sent: Tuesday, April 12, 2016 8:10 AM
> > To: tutu sky; Meng Xu
> > Cc: Xen-devel@lists.xen.org
> > Subject: Re: [Xen-devel] xenpm and scheduler
> >
> > On Tue, 2016-04-12 at 03:52 +0000, tutu sky wrote:
> > > Thanks Xu. I will do as desired about cross messaging.
> > >
> > > i need it because i exactly want to know that which part of the
> > > scheduler's corde (credit), takes effect from this feature. because
> > > it is important to me knowing that where would be trade off between
> > > idle state and doing load balancing, while cpuidle feature is
> > > activated. in other side it's important again for me that what will
> > > happen for 'cap; and 'weight' decreasing in a case that one core's
> > > frequency is lower than another one in the same socket (actually when
> > > cpufreq feature is enable).
> > >
> > Currently, there is no interaction between the scheduler and the power
> > management and frequency scaling layers.
> >
> > > Am i clear enough? can you give me an answer or maybe some lines of
> > > schedule.c or sched_credit.c's code which i can track them to notice
> > > the effect of xenpm on scheduler part of the view?
> > >
> > If you're saying that, for instance, the CPUs changing frequency can or
> > should affect some aspects of the scheduling algorithms (like credits
> > burning rate in Credit1 and Credit2, and budget burning rate in RTDS),
> > that is an interesting point which may indeed make sense, or at least
> > would deserve more investigation.
> >
> > But again, right now, there's no line of code to read to understand the
> > relationship, as there's no relationship at all.
> >
> > If you want to experiment on playing with xenpm, and seeing what effect
> > it has on scheduling, that will be very welcome. :-)
> >
> > 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

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: xenpm and scheduler

[tutu sky]

yeah, running xenpm gives short comments on its commands and their options but not about how to establish it.

I try my best for this :)
thanks a lot.

________________________________________
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Sent: Tuesday, April 12, 2016 5:08 PM
To: tutu sky
Cc: Dario Faggioli; Meng Xu; Xen-devel@lists.xen.org
Subject: Re: [Xen-devel] xenpm and scheduler

On Tue, Apr 12, 2016 at 05:04:04PM +0000, tutu sky wrote:
> Thanks Konrad. I will do :)
> Yeah, I believe so. as i can see that there is not any bios settings for power management in there (vmware).  I hope you be the correct party which i want to ask this question: there is a tutorial here in this page:
> 1) http://xenserver.org/partners/developing-products-for-xenserver/19-dev-help/138-xs-dev-perf-turbo.html
>
> which i know as a quick guide for establishing xenpm. my Q is that, are this page and this two page of xen.wiki below enough for establishing xenpm and make it work totally?
>
> 2) http://wiki.xenproject.org/wiki/Xenpm_command
> 3) http://wiki.xenproject.org/wiki/Xen_power_management
>
>  if yes, there is a problem, when i compiled xen from source, there is not any xensource folder in /opt folder in dom0 to follow the instructions in (1) address. i did all those instructions in dom0 config file instead.

Xen source != XenServer.


>
> if these guides are not enough in your point of view too, i think (just as a suggestion), xenpm needs more documentation, in order to clarify it's activation and usage progress. it remains a silent area in this giant project although is quiet usable.
>

If you run 'xenpm' by itself it gives you the options.

Patches to make an manpage for xenpm are always warmly welcome!
> thanks and regards.
>
> ________________________________________
> From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Sent: Tuesday, April 12, 2016 1:41 PM
> To: tutu sky
> Cc: Dario Faggioli; Meng Xu; Xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] xenpm and scheduler
>
> On Tue, Apr 12, 2016 at 11:50:42AM +0000, tutu sky wrote:
> > Thanks Dario,
> > Yeah, I do like playing with xenpm and try understanding relationship between this and scheduler. but i established a xen environment on vmware, but xenpm does not work correctly and even for 'cpufreq', it is silent at all! so it does not let me try to play with :(. I asked this problem before in the user and devel lists both,  but no body answered me. how can i track the problem, from who (I know that power management is out of your maintenance scope)?? (may xenpm have the same problem on a real platform (again) instead of vmware?)
> > thanks a lot.
>
> You will have to.
>
> I don't believe VMWare exposes C and P states to guests so therefore
> there is no power freqeuency in play.
>
> > regards.
> > ________________________________________
> > From: Dario Faggioli <dario.faggioli@citrix.com>
> > Sent: Tuesday, April 12, 2016 8:10 AM
> > To: tutu sky; Meng Xu
> > Cc: Xen-devel@lists.xen.org
> > Subject: Re: [Xen-devel] xenpm and scheduler
> >
> > On Tue, 2016-04-12 at 03:52 +0000, tutu sky wrote:
> > > Thanks Xu. I will do as desired about cross messaging.
> > >
> > > i need it because i exactly want to know that which part of the
> > > scheduler's corde (credit), takes effect from this feature. because
> > > it is important to me knowing that where would be trade off between
> > > idle state and doing load balancing, while cpuidle feature is
> > > activated. in other side it's important again for me that what will
> > > happen for 'cap; and 'weight' decreasing in a case that one core's
> > > frequency is lower than another one in the same socket (actually when
> > > cpufreq feature is enable).
> > >
> > Currently, there is no interaction between the scheduler and the power
> > management and frequency scaling layers.
> >
> > > Am i clear enough? can you give me an answer or maybe some lines of
> > > schedule.c or sched_credit.c's code which i can track them to notice
> > > the effect of xenpm on scheduler part of the view?
> > >
> > If you're saying that, for instance, the CPUs changing frequency can or
> > should affect some aspects of the scheduling algorithms (like credits
> > burning rate in Credit1 and Credit2, and budget burning rate in RTDS),
> > that is an interesting point which may indeed make sense, or at least
> > would deserve more investigation.
> >
> > But again, right now, there's no line of code to read to understand the
> > relationship, as there's no relationship at all.
> >
> > If you want to experiment on playing with xenpm, and seeing what effect
> > it has on scheduling, that will be very welcome. :-)
> >
> > 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
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: xenpm and scheduler

[Dario Faggioli]

[-- Attachment #1.1: Type: text/plain, Size: 6880 bytes --]

On Tue, 2016-04-12 at 17:46 +0000, tutu sky wrote:
> yeah, running xenpm gives short comments on its commands and their
> options but not about how to establish it.
> 
I do not understand what you mean with 'establishing' xenpm. If you run
Xen on a machine that has power management and/or frequency scaling
capabilities, you'll be able to use the various xenpm commands.

It most likely will have to be a real hardware box, as I don't think
emulation or nested virtualization satisfies the above condition (for
most of the emulator and hypervisor that I know of). You also need to
use a sufficiently recent Linux dom0 kernel. Konrad knows better than
me what's the minimum necessary version, but I don't think this is a
problem (i.e., any kernel since the last couple of years should work
fine).

Or was it something else you were asking?

Dario

> I try my best for this :)
> thanks a lot.
> 
> ________________________________________
> From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Sent: Tuesday, April 12, 2016 5:08 PM
> To: tutu sky
> Cc: Dario Faggioli; Meng Xu; Xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] xenpm and scheduler
> 
> On Tue, Apr 12, 2016 at 05:04:04PM +0000, tutu sky wrote:
> > 
> > Thanks Konrad. I will do :)
> > Yeah, I believe so. as i can see that there is not any bios
> > settings for power management in there (vmware).  I hope you be the
> > correct party which i want to ask this question: there is a
> > tutorial here in this page:
> > 1) http://xenserver.org/partners/developing-products-for-xenserver/
> > 19-dev-help/138-xs-dev-perf-turbo.html
> > 
> > which i know as a quick guide for establishing xenpm. my Q is that,
> > are this page and this two page of xen.wiki below enough for
> > establishing xenpm and make it work totally?
> > 
> > 2) http://wiki.xenproject.org/wiki/Xenpm_command
> > 3) http://wiki.xenproject.org/wiki/Xen_power_management
> > 
> >  if yes, there is a problem, when i compiled xen from source, there
> > is not any xensource folder in /opt folder in dom0 to follow the
> > instructions in (1) address. i did all those instructions in dom0
> > config file instead.
> Xen source != XenServer.
> 
> 
> > 
> > 
> > if these guides are not enough in your point of view too, i think
> > (just as a suggestion), xenpm needs more documentation, in order to
> > clarify it's activation and usage progress. it remains a silent
> > area in this giant project although is quiet usable.
> > 
> If you run 'xenpm' by itself it gives you the options.
> 
> Patches to make an manpage for xenpm are always warmly welcome!
> > 
> > thanks and regards.
> > 
> > ________________________________________
> > From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> > Sent: Tuesday, April 12, 2016 1:41 PM
> > To: tutu sky
> > Cc: Dario Faggioli; Meng Xu; Xen-devel@lists.xen.org
> > Subject: Re: [Xen-devel] xenpm and scheduler
> > 
> > On Tue, Apr 12, 2016 at 11:50:42AM +0000, tutu sky wrote:
> > > 
> > > Thanks Dario,
> > > Yeah, I do like playing with xenpm and try understanding
> > > relationship between this and scheduler. but i established a xen
> > > environment on vmware, but xenpm does not work correctly and even
> > > for 'cpufreq', it is silent at all! so it does not let me try to
> > > play with :(. I asked this problem before in the user and devel
> > > lists both,  but no body answered me. how can i track the
> > > problem, from who (I know that power management is out of your
> > > maintenance scope)?? (may xenpm have the same problem on a real
> > > platform (again) instead of vmware?)
> > > thanks a lot.
> > You will have to.
> > 
> > I don't believe VMWare exposes C and P states to guests so
> > therefore
> > there is no power freqeuency in play.
> > 
> > > 
> > > regards.
> > > ________________________________________
> > > From: Dario Faggioli <dario.faggioli@citrix.com>
> > > Sent: Tuesday, April 12, 2016 8:10 AM
> > > To: tutu sky; Meng Xu
> > > Cc: Xen-devel@lists.xen.org
> > > Subject: Re: [Xen-devel] xenpm and scheduler
> > > 
> > > On Tue, 2016-04-12 at 03:52 +0000, tutu sky wrote:
> > > > 
> > > > Thanks Xu. I will do as desired about cross messaging.
> > > > 
> > > > i need it because i exactly want to know that which part of the
> > > > scheduler's corde (credit), takes effect from this feature.
> > > > because
> > > > it is important to me knowing that where would be trade off
> > > > between
> > > > idle state and doing load balancing, while cpuidle feature is
> > > > activated. in other side it's important again for me that what
> > > > will
> > > > happen for 'cap; and 'weight' decreasing in a case that one
> > > > core's
> > > > frequency is lower than another one in the same socket
> > > > (actually when
> > > > cpufreq feature is enable).
> > > > 
> > > Currently, there is no interaction between the scheduler and the
> > > power
> > > management and frequency scaling layers.
> > > 
> > > > 
> > > > Am i clear enough? can you give me an answer or maybe some
> > > > lines of
> > > > schedule.c or sched_credit.c's code which i can track them to
> > > > notice
> > > > the effect of xenpm on scheduler part of the view?
> > > > 
> > > If you're saying that, for instance, the CPUs changing frequency
> > > can or
> > > should affect some aspects of the scheduling algorithms (like
> > > credits
> > > burning rate in Credit1 and Credit2, and budget burning rate in
> > > RTDS),
> > > that is an interesting point which may indeed make sense, or at
> > > least
> > > would deserve more investigation.
> > > 
> > > But again, right now, there's no line of code to read to
> > > understand the
> > > relationship, as there's no relationship at all.
> > > 
> > > If you want to experiment on playing with xenpm, and seeing what
> > > effect
> > > it has on scheduling, that will be very welcome. :-)
> > > 
> > > 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
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
-- 
<<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)


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_______________________________________________
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http://lists.xen.org/xen-devel

Re: xenpm and scheduler

[tutu sky]

Dario, let me try it in real hardware and i'll back reporting here. I know that there are some distros which are suitable to be dom0:
http://wiki.xenproject.org/wiki/Dom0_Kernels_for_Xen
I think i choose my distro correctly (ubuntu 14.04 LTS) and i can see xen related configurations in its .config file.

i thought as same as you but after reading devel lists and people's problem with this feature, i noticed maybe using xenpm needs make some modification about acpi in dom0's .config file, which leads to kernel building again. I'm not sure now and after running my setup on a real hardware, i'll back to report here.
those people who encountered problems, used real hardware.

Thanks for discussing.
regards.
________________________________________
From: Dario Faggioli <dario.faggioli@citrix.com>
Sent: Tuesday, April 12, 2016 9:05 PM
To: tutu sky; Konrad Rzeszutek Wilk
Cc: Meng Xu; Xen-devel@lists.xen.org
Subject: Re: [Xen-devel] xenpm and scheduler

On Tue, 2016-04-12 at 17:46 +0000, tutu sky wrote:
> yeah, running xenpm gives short comments on its commands and their
> options but not about how to establish it.
>
I do not understand what you mean with 'establishing' xenpm. If you run
Xen on a machine that has power management and/or frequency scaling
capabilities, you'll be able to use the various xenpm commands.

It most likely will have to be a real hardware box, as I don't think
emulation or nested virtualization satisfies the above condition (for
most of the emulator and hypervisor that I know of). You also need to
use a sufficiently recent Linux dom0 kernel. Konrad knows better than
me what's the minimum necessary version, but I don't think this is a
problem (i.e., any kernel since the last couple of years should work
fine).

Or was it something else you were asking?

Dario

> I try my best for this :)
> thanks a lot.
>
> ________________________________________
> From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> Sent: Tuesday, April 12, 2016 5:08 PM
> To: tutu sky
> Cc: Dario Faggioli; Meng Xu; Xen-devel@lists.xen.org
> Subject: Re: [Xen-devel] xenpm and scheduler
>
> On Tue, Apr 12, 2016 at 05:04:04PM +0000, tutu sky wrote:
> >
> > Thanks Konrad. I will do :)
> > Yeah, I believe so. as i can see that there is not any bios
> > settings for power management in there (vmware).  I hope you be the
> > correct party which i want to ask this question: there is a
> > tutorial here in this page:
> > 1) http://xenserver.org/partners/developing-products-for-xenserver/
> > 19-dev-help/138-xs-dev-perf-turbo.html
> >
> > which i know as a quick guide for establishing xenpm. my Q is that,
> > are this page and this two page of xen.wiki below enough for
> > establishing xenpm and make it work totally?
> >
> > 2) http://wiki.xenproject.org/wiki/Xenpm_command
> > 3) http://wiki.xenproject.org/wiki/Xen_power_management
> >
> >  if yes, there is a problem, when i compiled xen from source, there
> > is not any xensource folder in /opt folder in dom0 to follow the
> > instructions in (1) address. i did all those instructions in dom0
> > config file instead.
> Xen source != XenServer.
>
>
> >
> >
> > if these guides are not enough in your point of view too, i think
> > (just as a suggestion), xenpm needs more documentation, in order to
> > clarify it's activation and usage progress. it remains a silent
> > area in this giant project although is quiet usable.
> >
> If you run 'xenpm' by itself it gives you the options.
>
> Patches to make an manpage for xenpm are always warmly welcome!
> >
> > thanks and regards.
> >
> > ________________________________________
> > From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> > Sent: Tuesday, April 12, 2016 1:41 PM
> > To: tutu sky
> > Cc: Dario Faggioli; Meng Xu; Xen-devel@lists.xen.org
> > Subject: Re: [Xen-devel] xenpm and scheduler
> >
> > On Tue, Apr 12, 2016 at 11:50:42AM +0000, tutu sky wrote:
> > >
> > > Thanks Dario,
> > > Yeah, I do like playing with xenpm and try understanding
> > > relationship between this and scheduler. but i established a xen
> > > environment on vmware, but xenpm does not work correctly and even
> > > for 'cpufreq', it is silent at all! so it does not let me try to
> > > play with :(. I asked this problem before in the user and devel
> > > lists both,  but no body answered me. how can i track the
> > > problem, from who (I know that power management is out of your
> > > maintenance scope)?? (may xenpm have the same problem on a real
> > > platform (again) instead of vmware?)
> > > thanks a lot.
> > You will have to.
> >
> > I don't believe VMWare exposes C and P states to guests so
> > therefore
> > there is no power freqeuency in play.
> >
> > >
> > > regards.
> > > ________________________________________
> > > From: Dario Faggioli <dario.faggioli@citrix.com>
> > > Sent: Tuesday, April 12, 2016 8:10 AM
> > > To: tutu sky; Meng Xu
> > > Cc: Xen-devel@lists.xen.org
> > > Subject: Re: [Xen-devel] xenpm and scheduler
> > >
> > > On Tue, 2016-04-12 at 03:52 +0000, tutu sky wrote:
> > > >
> > > > Thanks Xu. I will do as desired about cross messaging.
> > > >
> > > > i need it because i exactly want to know that which part of the
> > > > scheduler's corde (credit), takes effect from this feature.
> > > > because
> > > > it is important to me knowing that where would be trade off
> > > > between
> > > > idle state and doing load balancing, while cpuidle feature is
> > > > activated. in other side it's important again for me that what
> > > > will
> > > > happen for 'cap; and 'weight' decreasing in a case that one
> > > > core's
> > > > frequency is lower than another one in the same socket
> > > > (actually when
> > > > cpufreq feature is enable).
> > > >
> > > Currently, there is no interaction between the scheduler and the
> > > power
> > > management and frequency scaling layers.
> > >
> > > >
> > > > Am i clear enough? can you give me an answer or maybe some
> > > > lines of
> > > > schedule.c or sched_credit.c's code which i can track them to
> > > > notice
> > > > the effect of xenpm on scheduler part of the view?
> > > >
> > > If you're saying that, for instance, the CPUs changing frequency
> > > can or
> > > should affect some aspects of the scheduling algorithms (like
> > > credits
> > > burning rate in Credit1 and Credit2, and budget burning rate in
> > > RTDS),
> > > that is an interesting point which may indeed make sense, or at
> > > least
> > > would deserve more investigation.
> > >
> > > But again, right now, there's no line of code to read to
> > > understand the
> > > relationship, as there's no relationship at all.
> > >
> > > If you want to experiment on playing with xenpm, and seeing what
> > > effect
> > > it has on scheduling, that will be very welcome. :-)
> > >
> > > 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
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xen.org
> http://lists.xen.org/xen-devel
--
<<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)

_______________________________________________
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Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

Re: xenpm and scheduler

[Konrad Rzeszutek Wilk]

On Wed, Apr 13, 2016 at 08:21:46AM +0000, tutu sky wrote:
> Dario, let me try it in real hardware and i'll back reporting here. I know that there are some distros which are suitable to be dom0:
> http://wiki.xenproject.org/wiki/Dom0_Kernels_for_Xen
> I think i choose my distro correctly (ubuntu 14.04 LTS) and i can see xen related configurations in its .config file.
> 
> i thought as same as you but after reading devel lists and people's problem with this feature, i noticed maybe using xenpm needs make some modification about acpi in dom0's .config file, which leads to kernel building again. I'm not sure now and after running my setup on a real hardware, i'll back to report here.
> those people who encountered problems, used real hardware.

Right, you may just want to use the distro supplied version of Xen
first.

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http://lists.xen.org/xen-devel

Re: xenpm and scheduler

[Dario Faggioli]

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On Wed, 2016-04-13 at 08:21 +0000, tutu sky wrote:
> Dario, let me try it in real hardware and i'll back reporting here. I
> know that there are some distros which are suitable to be dom0:
> http://wiki.xenproject.org/wiki/Dom0_Kernels_for_Xen
> I think i choose my distro correctly (ubuntu 14.04 LTS) and i can see
> xen related configurations in its .config file.
> 
I think Ubuntu 14.04 would be fine. If I'd have to choose, I'd use an
even more recent one.

> i thought as same as you but after reading devel lists and people's
> problem with this feature, i noticed maybe using xenpm needs make
> some modification about acpi in dom0's .config file, which leads to
> kernel building again. I'm not sure now and after running my setup on
> a real hardware, i'll back to report here.
> those people who encountered problems, used real hardware.
> 
I don't know what issues you are talking about, and whether they may be
related to Ubuntu 14.04, and/or to the dom0 kernel version shipped with
it.

Again, I'd suggest just going for something "current", no big deal if
it's not LTS. Fedora 23, or a recent OpenSUSE, or Ubuntu 15.10... I'm
pretty sure you'll be able to get a setup on which you can try to use
xenpm quite quickly with any of them.

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)


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