Hi

Sent from yet another low power ARM device

On 24 Jun 2013, at 06:46, "Aditya" aditya.ps@samsung.com wrote:

Hi Serge,

Thanks a lot for the report.

I have couple of queries:

1. what is Golden Board (configuration ?) ?

2. could you please send me b.L MP test suite ?

(I believe that b.L MP test suite is open to member companies)

...

...

https://blueprints.launchpad.net/linaro-big-little-system/+spec/sched-cooper... Postponed. Priorities are to be re-evaluate .

Requesting you to please let me know the status of this, hope this will not have affect b.L MP final schedule ?

4. I believe that there is some issue in my mail client, as this report is

dated 18th June, but I receiving it today, that is on 24th June. (I will check this issue with my system administrator)

Thanks and best regards, Aditya

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From: "Serge Broslavsky" serge.broslavsky@linaro.org Sent: Monday, June 24, 2013 12:28 AM To: "linaro-dev" linaro-dev@lists.linaro.org Cc: "Scott Bambrough" scott.bambrough@linaro.org; "Berny Goodheart" berny.goodheart@huawei.com; "Serge Broslavsky" serge.broslavsky@linaro.org; "Tech Leads" techleads@linaro.org; "David Rusling" david.rusling@linaro.org; "George Grey" george.grey@linaro.org; "Alexander Sack" asac@linaro.org; "Joe Bates" joe.bates@linaro.org; "Mark Orvek" mark.orvek@linaro.org; "Kate Stewart" kate.stewart@linaro.org; "David Zinman" david.zinman@linaro.org Subject: big.LITTLE MP status June 18, 2013

...

https://wiki.linaro.org/projects/big.LITTLE.MP

Work Items for functional completion: https://wiki.linaro.org/projects/big.LITTLE.MP/WorkItems

Main Project page: https://launchpad.net/linaro-big-little-system

Development

1. big.LITTLE IKS

IKS snapshot: git://git.linaro.org/landing-teams/working/arm/kernel.git

More information: http://lists.linaro.org/pipermail/linaro-dev/2013-May/015882.html

Also the latest Linaro 13.05 release contains big.LITTLE release with IKS code integrated. By default MP is used (IKS is off). To enable IKS:

  echo 1 > /sys/kernel/bL_switcher/active

Same is planned for Linaro 12.06 release.

2. big.LITTLE MP

There are two branches, which are functionally equivalent - they tweak the scheduler to select the right processes to move to the A15 and try to decrease power consumption while maintaining performance.

• A Reference big.LITTLE MP patchset (based on ARM Beta patchset), merged with linux-linaro:

https://git.linaro.org/gitweb?p=arm/big.LITTLE/mp.git%3Ba=shortlog%3Bh=refs/...

  Recommended to be used for testing.

• And an upstream (work in progress) big.LITTLE MP patchset:

https://git.linaro.org/gitweb?p=arm/big.LITTLE/mp.git%3Ba=shortlog%3Bh=refs/...

  Being worked on in order to achieve the performance/power
  numbers of the reference one. Upstream discussion is ongoing.

• Documentation:

  Code flow is already covered by several LWN articles. See https://wiki.linaro.org/WorkingGroups/PowerManagement/Doc/ in the Articles section. We will provide a tuning guide once we have reached agreement upstream.

• Automated benchmarking code is ready:

  • Golden Board is to be used for running daily tests.
  • Both branches - reference and upstream to be tested in the future.

Blueprint Updates

https://blueprints.launchpad.net/linaro-big-little-system/+spec/big-little-m...

Ongoing work.

https://blueprints.launchpad.net/linaro-big-little-system/+spec/small-task-p...

• Big variation previously seen is not visible on the Golden Board. It might be caused by an USB stick with insufficiently high speed - working on this hypothesis.

• Latest patchset (not yet published upstream) shows low delta with the reference patch set results.

https://blueprints.launchpad.net/linaro-big-little-system/+spec/sched-cooper...

- Postponed. Priorities are to be re-evaluated.

QA

big.LITTLE MP LAVA Dashboard http://validation.linaro.org/lava-server/dashboard/image-reports/linaro-andr...

Testing (week 25):

sched_tests.git #Cases #Run Pass Fail Absolute pass rate Regression 20 19 19 0 100 % mpbasicsuite 14 10 10 0 100 % mpcoresuite 10 6 6 0 84 % [1][2] mpextendedsuite 20 10 7 3 70 % [3] mploadbalance 2 2 2 0 100 %

---

[1] https://bugs.launchpad.net/linaro-big-little-system/+bug/1188655 [2] core_test_scn02.1 reported failed in full execution and passed independently: https://pastebin.linaro.org/view/21cf80f3 [3] https://bugs.launchpad.net/linaro-big-little-system/+bug/1183769

Bugs: https://bugs.launchpad.net/linaro-big-little-system/+bugs?field.tag=bl-mp

Highlight: Bug 1166246 - Lockup on post 3.9 IKS kernel

  - can be hardware or software bug, investigation continues.
  - seems to be related to MMC being in use (switching to USB
    stick can be used as a reliable workaround).

Highlight: Bug 1183821 - perf failed to count events on A15 cluster

  - existing perf code is at the end of it's lifecycle.
  - a rewrite is ongoing.
  - will stay unfixed for Linaro 13.6 release.

-- Best Regards, Serge Broslavsky serge.broslavsky@linaro.org

Project Manager, Linaro M: +37129426328 IRC: ototo Skype: serge.broslavsky http://linaro.org | Open source software for ARM SoCs

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