Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems

From	Juri Lelli <juri.lelli@arm.com>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems
Date	2016-01-19 15:30 +0100
Message-ID	<qSFsf-Eb-49@gated-at.bofh.it> (permalink)
References	(3 earlier) <qSkH8-33d-19@gated-at.bofh.it> <qSl0u-3eo-23@gated-at.bofh.it> <qSla9-3jC-7@gated-at.bofh.it> <qSCkG-6VX-9@gated-at.bofh.it> <qSCE2-730-13@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On 19/01/16 11:23, Juri Lelli wrote:
> Hi Catalin,
> 
> On 19/01/16 10:59, Catalin Marinas wrote:
> > On Mon, Jan 18, 2016 at 05:42:58PM +0100, Vincent Guittot wrote:
> > > On 18 January 2016 at 17:30, Juri Lelli <juri.lelli@arm.com> wrote:
> > > > On 18/01/16 17:13, Vincent Guittot wrote:
> > > >> On 18 January 2016 at 16:13, Juri Lelli <juri.lelli@arm.com> wrote:
> > > >> > On 15/01/16 11:50, Steve Muckle wrote:
> > > >> >> On 01/08/2016 06:09 AM, Juri Lelli wrote:

[...]

> > 
> > Two questions:
> > 
> > 1. How is the boot time affected by the benchmark?
> > 2. How is the boot time affected by considering all the CPUs the same?
> > 
> > My preference is for DT and sysfs (especially useful for
> > development/tuning) but I'm not opposed to a boot-time benchmark if
> > people insist on it. If the answer to point 2 is "insignificant", we
> > could as well defer the capacity setting to user space (sysfs).
> > 
> 
> Given that we are not targeting boot time with this, but rather better
> performance afterwards, I don't expect significant differences; but,
> I'll get numbers :).
> 

I've got some boot time numbers on TC2 and Juno based on timestamps.
They are of course not accurate and maybe not so representative of
products, but I guess still ballpark right.

I'm generally seeing ~1sec increase in boot time for 1 and practically
no difference for 2 (even after having added patches that provide
runtime performance improvements).

Best,

- Juri

Thread

Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Steve Muckle <steve.muckle@linaro.org> - 2016-01-15 21:00 +0100
  Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-18 16:20 +0100
    Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems Vincent Guittot <vincent.guittot@linaro.org> - 2016-01-18 17:20 +0100
      Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-18 17:40 +0100
        Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems Vincent Guittot <vincent.guittot@linaro.org> - 2016-01-18 17:50 +0100
          Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-18 18:10 +0100
            Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous systems Vincent Guittot <vincent.guittot@linaro.org> - 2016-01-18 18:30 +0100
          Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Catalin Marinas <catalin.marinas@arm.com> - 2016-01-19 12:10 +0100
            Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-19 12:30 +0100
              Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-19 15:30 +0100
                Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Steve Muckle <steve.muckle@linaro.org> - 2016-01-19 20:50 +0100
                Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Mark Brown <broonie@kernel.org> - 2016-01-19 22:20 +0100
                Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Juri Lelli <juri.lelli@arm.com> - 2016-01-20 11:30 +0100
    Re: [RFC PATCH v2 0/4] CPUs capacity information for heterogeneous  systems Steve Muckle <steve.muckle@linaro.org> - 2016-01-18 20:30 +0100

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