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)
3.
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
-------------------------------------------------- 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
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/activeSame is planned for Linaro 12.06 release.
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