Hi Serge,

I think I've emailed to you before. This report is out if date and misleading.

Can we please do one of two things:

1. Correct it to reflect what is happening.

2. Stop sending them.

FYI. There is no requirement for any tuning guide for MP this has already been produced and delivered to licensee's.

Our beta patchset is considered functionally complete and we are looking to Linaro to support this in the LSK until the upstreaming activities for MP have been completed by ARM.

While the upstreaming activities are ongoing we are looking for second LEB reflecting tip of tree to also be available mainly targeting the relevant folk who are working on the refactored patchset.

Suggest you work with SteveB and RobinR to ensure we are aligned.

Thanks

Roger

Sent from yet another low power ARM device

On 23 Jun 2013, at 20:03, "Serge Broslavsky" serge.broslavsky@linaro.org wrote:

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

---

linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev

-- IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.