Re: [PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-18 Thread Andreas Herrmann
On Wed, Jul 18, 2018 at 10:23:52AM +0200, Peter Zijlstra wrote: > On Tue, Jul 17, 2018 at 10:13:23PM +0200, Andreas Herrmann wrote: > > On Tue, Jul 17, 2018 at 06:14:58PM +0200, Rafael J. Wysocki wrote: > > > From: Rafael J. Wysocki > > > > > > The firmware interface used by the pcc-cpufreq

Re: [PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-18 Thread Andreas Herrmann
On Wed, Jul 18, 2018 at 10:23:52AM +0200, Peter Zijlstra wrote: > On Tue, Jul 17, 2018 at 10:13:23PM +0200, Andreas Herrmann wrote: > > On Tue, Jul 17, 2018 at 06:14:58PM +0200, Rafael J. Wysocki wrote: > > > From: Rafael J. Wysocki > > > > > > The firmware interface used by the pcc-cpufreq

Re: [PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-18 Thread Peter Zijlstra
On Tue, Jul 17, 2018 at 10:13:23PM +0200, Andreas Herrmann wrote: > On Tue, Jul 17, 2018 at 06:14:58PM +0200, Rafael J. Wysocki wrote: > > From: Rafael J. Wysocki > > > > The firmware interface used by the pcc-cpufreq driver is > > fundamentally not scalable and using it for dynamic CPU

Re: [PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-18 Thread Peter Zijlstra
On Tue, Jul 17, 2018 at 10:13:23PM +0200, Andreas Herrmann wrote: > On Tue, Jul 17, 2018 at 06:14:58PM +0200, Rafael J. Wysocki wrote: > > From: Rafael J. Wysocki > > > > The firmware interface used by the pcc-cpufreq driver is > > fundamentally not scalable and using it for dynamic CPU

Re: [PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-18 Thread Rafael J. Wysocki
On Tue, Jul 17, 2018 at 10:13 PM, Andreas Herrmann wrote: > On Tue, Jul 17, 2018 at 06:14:58PM +0200, Rafael J. Wysocki wrote: >> From: Rafael J. Wysocki >> >> The firmware interface used by the pcc-cpufreq driver is >> fundamentally not scalable and using it for dynamic CPU performance >>

Re: [PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-18 Thread Rafael J. Wysocki
On Tue, Jul 17, 2018 at 10:13 PM, Andreas Herrmann wrote: > On Tue, Jul 17, 2018 at 06:14:58PM +0200, Rafael J. Wysocki wrote: >> From: Rafael J. Wysocki >> >> The firmware interface used by the pcc-cpufreq driver is >> fundamentally not scalable and using it for dynamic CPU performance >>

Re: [PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-18 Thread Andreas Herrmann
On Tue, Jul 17, 2018 at 06:14:58PM +0200, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki > > The firmware interface used by the pcc-cpufreq driver is > fundamentally not scalable and using it for dynamic CPU performance > scaling on systems with many CPUs leads to degraded performance. > >

Re: [PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-18 Thread Andreas Herrmann
On Tue, Jul 17, 2018 at 06:14:58PM +0200, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki > > The firmware interface used by the pcc-cpufreq driver is > fundamentally not scalable and using it for dynamic CPU performance > scaling on systems with many CPUs leads to degraded performance. > >

[PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-17 Thread Rafael J. Wysocki
From: Rafael J. Wysocki The firmware interface used by the pcc-cpufreq driver is fundamentally not scalable and using it for dynamic CPU performance scaling on systems with many CPUs leads to degraded performance. For this reason, disable dynamic CPU performance scaling on systems with

[PATCH v2] cpufreq: pcc-cpufreq: Disable dynamic scaling on many-CPU systems

2018-07-17 Thread Rafael J. Wysocki
From: Rafael J. Wysocki The firmware interface used by the pcc-cpufreq driver is fundamentally not scalable and using it for dynamic CPU performance scaling on systems with many CPUs leads to degraded performance. For this reason, disable dynamic CPU performance scaling on systems with