#panfrost on 2020-04-02 — irc logs at freenode.irclog.whitequark.org

2019-09-06 11:20 alyssa changed the topic of #panfrost to: Panfrost - FLOSS Mali Midgard & Bifrost - Logs https://freenode.irclog.whitequark.org/panfrost - <daniels> avoiding X is a huge feature

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03:20 <icecream95> Does RK3288 not have symmetrical CPU cores? I've got a program that runs over 30% faster on CPU 0 than any other core.

03:23 <HdkR> 3288 is just 4xCortex-A17

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03:57 <anarsoul> icecream95: check if all your irqs are handled on cpu0 :)

04:17 <icecream95> I have a reproducer: https://gitlab.freedesktop.org/snippets/944

04:21 <HdkR> Time difference of allocating on CPU0 versus any other CPU?

04:29 <icecream95> HdkR: I don't think so. I added some output from perf to the snippet description

04:33 <icecream95> perf stat shows an IPC value of 1.75 for cpu 0 and 1.23 for cpu 1

04:52 <tomeu> alyssa: robher: this is the kernel branch: https://gitlab.freedesktop.org/tomeu/linux/-/commits/bifrost/

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07:05 <icecream95> HdkR, anarsoul: Now I've got it running twice as fast on CPU 0: https://gitlab.freedesktop.org/snippets/945

07:09 <HdkR> Do you have the governors set to something other than performance for this testing?

07:10 <icecream95> I am using performance

07:11 <HdkR> Fun stuff

07:15 <icecream95> I have a 3 instruction example: L1: cmp r1, r2 / addne r1, r1, #1 / bne L1

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16:07 <robmur01_> alyssa, robher: best guess for that oops is that mapping->mmu->pgtable_ops is NULL, so mapping->mmu might be bogus by that point

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16:32 <Venemo> hey guys

16:48 <Venemo> alyssa: was it you in the BoF who asked about scheduling?

16:52 <anarsoul> iirc it was her

16:57 <Venemo> what does panfrost currently have for a scheduler?

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21:03 <icecream95> HdkR: All cores are slow until suspend / resume, so this is definitely a kernel bug

21:31 <robmur01_> icecream95: if you hotplug off CPU0, do you still see a relative difference between the remaining cores?

21:33 <icecream95> cannot access '/sys/devices/system/cpu/cpu0/online': No such file or directory

21:57 <robmur01_> :(

21:58 <robmur01_> guess I'm too used to 64-bit where everything has PSCI and CPU hotplug enabled...

22:00 * robmur01_ glances guiltily at 3288 box that still needs some work to bring it back to life...

22:12 * HdkR looks at the ProX that still isn't running Linux

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