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;a=shortlog;h=refs/heads/linux-linaro-MP-reference-20130524.0 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;a=shortlog;h=refs/heads/linux-linaro-MP-upstream-20130524.0 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-mp-integration-tree Ongoing work. * https://blueprints.launchpad.net/linaro-big-little-system/+spec/small-task-packing-in-scheduler - 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-cooperation-with-dvfs - Postponed. Priorities are to be re-evaluated. QA == big.LITTLE MP LAVA Dashboard http://validation.linaro.org/lava-server/dashboard/image-reports/linaro-android_vexpress-linaro-mp 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.broslav...@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
