On 25 March 2017 at 04:48, Joel Fernandes wrote:
> Hi Vincent,
>
> On Thu, Mar 23, 2017 at 3:08 PM, Vincent Guittot
> wrote:
> [..]
> So I'm not really aligned with the description of your problem: PELT
> metric underestimates the load of the CPU. The PELT is just about
> tracki
Hi Vincent,
On Thu, Mar 23, 2017 at 3:08 PM, Vincent Guittot
wrote:
[..]
>>>
So I'm not really aligned with the description of your problem: PELT
metric underestimates the load of the CPU. The PELT is just about
tracking CFS task utilization but not whole CPU utilization and
On 23 March 2017 at 00:56, Joel Fernandes wrote:
> On Mon, Mar 20, 2017 at 5:34 AM, Patrick Bellasi
> wrote:
>> On 20-Mar 09:26, Vincent Guittot wrote:
>>> On 20 March 2017 at 04:57, Viresh Kumar wrote:
>>> > On 19-03-17, 14:34, Rafael J. Wysocki wrote:
>>> >> From: Rafael J. Wysocki
>>> >>
>>>
On Mon, Mar 20, 2017 at 5:34 AM, Patrick Bellasi
wrote:
> On 20-Mar 09:26, Vincent Guittot wrote:
>> On 20 March 2017 at 04:57, Viresh Kumar wrote:
>> > On 19-03-17, 14:34, Rafael J. Wysocki wrote:
>> >> From: Rafael J. Wysocki
>> >>
>> >> The PELT metric used by the schedutil governor underesti
On 20-Mar 14:05, Rafael J. Wysocki wrote:
> On Monday, March 20, 2017 01:06:15 PM Patrick Bellasi wrote:
> > On 20-Mar 13:50, Peter Zijlstra wrote:
> > > On Mon, Mar 20, 2017 at 01:35:12PM +0100, Rafael J. Wysocki wrote:
> > > > On Monday, March 20, 2017 11:36:45 AM Peter Zijlstra wrote:
> > > > >
On Monday, March 20, 2017 01:06:15 PM Patrick Bellasi wrote:
> On 20-Mar 13:50, Peter Zijlstra wrote:
> > On Mon, Mar 20, 2017 at 01:35:12PM +0100, Rafael J. Wysocki wrote:
> > > On Monday, March 20, 2017 11:36:45 AM Peter Zijlstra wrote:
> > > > On Sun, Mar 19, 2017 at 02:34:32PM +0100, Rafael J.
On 20 March 2017 at 13:59, Rafael J. Wysocki wrote:
> On Monday, March 20, 2017 09:26:34 AM Vincent Guittot wrote:
>> On 20 March 2017 at 04:57, Viresh Kumar wrote:
>> > On 19-03-17, 14:34, Rafael J. Wysocki wrote:
>> >> From: Rafael J. Wysocki
>> >>
>> >> The PELT metric used by the schedutil g
On Monday, March 20, 2017 09:27:45 AM Viresh Kumar wrote:
> On 19-03-17, 14:34, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki
> >
> > The PELT metric used by the schedutil governor underestimates the
> > CPU utilization in some cases. The reason for that may be time spent
> > in interrupt
On Monday, March 20, 2017 01:50:09 PM Peter Zijlstra wrote:
> On Mon, Mar 20, 2017 at 01:35:12PM +0100, Rafael J. Wysocki wrote:
> > On Monday, March 20, 2017 11:36:45 AM Peter Zijlstra wrote:
> > > On Sun, Mar 19, 2017 at 02:34:32PM +0100, Rafael J. Wysocki wrote:
> > > > From: Rafael J. Wysocki
On Monday, March 20, 2017 09:26:34 AM Vincent Guittot wrote:
> On 20 March 2017 at 04:57, Viresh Kumar wrote:
> > On 19-03-17, 14:34, Rafael J. Wysocki wrote:
> >> From: Rafael J. Wysocki
> >>
> >> The PELT metric used by the schedutil governor underestimates the
> >> CPU utilization in some case
On 20-Mar 13:50, Peter Zijlstra wrote:
> On Mon, Mar 20, 2017 at 01:35:12PM +0100, Rafael J. Wysocki wrote:
> > On Monday, March 20, 2017 11:36:45 AM Peter Zijlstra wrote:
> > > On Sun, Mar 19, 2017 at 02:34:32PM +0100, Rafael J. Wysocki wrote:
> > > > From: Rafael J. Wysocki
> > > >
> > > > The
On Mon, Mar 20, 2017 at 01:35:12PM +0100, Rafael J. Wysocki wrote:
> On Monday, March 20, 2017 11:36:45 AM Peter Zijlstra wrote:
> > On Sun, Mar 19, 2017 at 02:34:32PM +0100, Rafael J. Wysocki wrote:
> > > From: Rafael J. Wysocki
> > >
> > > The PELT metric used by the schedutil governor underest
On Monday, March 20, 2017 11:38:15 AM Peter Zijlstra wrote:
> On Sun, Mar 19, 2017 at 10:24:24PM +0100, Rafael J. Wysocki wrote:
>
> > Honestly, if the processor had been capable of doing per-core P-states, that
> > would have been a disaster and there are customers who wouldn't look at
> > schedu
On Monday, March 20, 2017 11:36:45 AM Peter Zijlstra wrote:
> On Sun, Mar 19, 2017 at 02:34:32PM +0100, Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki
> >
> > The PELT metric used by the schedutil governor underestimates the
> > CPU utilization in some cases. The reason for that may be tim
On 20-Mar 09:26, Vincent Guittot wrote:
> On 20 March 2017 at 04:57, Viresh Kumar wrote:
> > On 19-03-17, 14:34, Rafael J. Wysocki wrote:
> >> From: Rafael J. Wysocki
> >>
> >> The PELT metric used by the schedutil governor underestimates the
> >> CPU utilization in some cases. The reason for th
On Sun, Mar 19, 2017 at 02:34:32PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki
>
> The PELT metric used by the schedutil governor underestimates the
> CPU utilization in some cases. The reason for that may be time spent
> in interrupt handlers and similar which is not accounted for
On Sun, Mar 19, 2017 at 10:24:24PM +0100, Rafael J. Wysocki wrote:
> Honestly, if the processor had been capable of doing per-core P-states, that
> would have been a disaster and there are customers who wouldn't look at
> schedutil again after being confronted with these numbers.
This, I feel, is
On 20 March 2017 at 04:57, Viresh Kumar wrote:
> On 19-03-17, 14:34, Rafael J. Wysocki wrote:
>> From: Rafael J. Wysocki
>>
>> The PELT metric used by the schedutil governor underestimates the
>> CPU utilization in some cases. The reason for that may be time spent
>> in interrupt handlers and si
On 19-03-17, 14:34, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki
>
> The PELT metric used by the schedutil governor underestimates the
> CPU utilization in some cases. The reason for that may be time spent
> in interrupt handlers and similar which is not accounted for by PELT.
>
> That ca
On Sunday, March 19, 2017 10:24:24 PM Rafael J. Wysocki wrote:
> On Sunday, March 19, 2017 02:34:32 PM Rafael J. Wysocki wrote:
> > From: Rafael J. Wysocki
> >
> > The PELT metric used by the schedutil governor underestimates the
> > CPU utilization in some cases. The reason for that may be time
On Sunday, March 19, 2017 02:34:32 PM Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki
>
> The PELT metric used by the schedutil governor underestimates the
> CPU utilization in some cases. The reason for that may be time spent
> in interrupt handlers and similar which is not accounted for by
From: Rafael J. Wysocki
The PELT metric used by the schedutil governor underestimates the
CPU utilization in some cases. The reason for that may be time spent
in interrupt handlers and similar which is not accounted for by PELT.
That can be easily demonstrated by running kernel compilation on
a
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