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<warpme_>
megi: glxgears on H6? How You get t720 on panfrost? beside white-listing - did You do enything special to get SFBD hw (t720) working on panfrost?
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<tuxd3v>
kernel 5.0 has /sys/kernel/debug/regulator/regulator_summary
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<plaes>
wens: do you think we should add CONFIG_MICREL_PHY=y to sunxi_defconfig, due to its errata issues and the fact that it fixes issues with Olinuxino-Lime2 boards?
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<wens>
I'd think so
<plaes>
ok, thanks, I'll cook up the patch
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<warpme_>
clementp[m]: wow indeed. glxgears gives me 269 frames in 5.0 seconds = 53.640 FPS and nice wheels on screen. My app (mythtv) still white screen however. Anyway VERY promising IMHO!!!!
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<megi>
it's a random collection of things I needed for debugging in the past few years
<megi>
it's a mix of a83t, h3, h5, h6, a13
<anarsoul>
I mean binning
<megi>
ah
<megi>
h6 + a83t
<megi>
I didn't see it on other soc
<megi>
socs
<anarsoul>
interesting
<megi>
yep, fastest a83t bins can go over 2GHz
<anarsoul>
but a83t has powervr graphics
<megi>
yes
<megi>
but if people can't do graphics with 8x2GHz SIMD capable cores,... maybe they shouldn't
<tuxd3v>
a83t is armv7?
<megi>
yes
<megi>
a7
<tuxd3v>
neon 1.0
<tuxd3v>
SIMD
<anarsoul>
megi: 2ghz in-order cores
<tuxd3v>
I didin't kew much about binning
<megi>
it's slightly worse SIMD than on A8, yes
<megi>
anyway, it sucks it has Power VR
<anarsoul>
yeah
<anarsoul>
IIRC it requires firmware, so zero to no chances to RE it
<tuxd3v>
I believe they run a operating system much like the modems do.. I saw that in some slides..
<anarsoul>
crazy
<megi>
anyway, I'm not really missing it, I can do rendering with cairo on CPU at 60FPS and still have some frame budget
<anarsoul>
well
<anarsoul>
it could have been more efficient with GPU :)
<megi>
who knows :) I still have 7 CPU cores left to do other things
<anarsoul>
do you have memory bandwidth for these cores though?
<megi>
8 core full load really takes the power consumption to new levels for sure, though :)
<megi>
that's a problem with ARM instructions, but I can get more bandwidth using SIMD, for some reason
<megi>
I haven't done any serious benchmarks, but as an example on the e-ink reader, (single core A8 ARM cpu), I needed to copy bulk data with some simple shifts and ors, and going from ARM to SIMD intrinsics was a change from 58ms to ~1ms
<megi>
interestingly the same SIMD function was a bit faster when executed in the kernel space, than in userspace (1.2ms vs 800ms)
<megi>
maybe because kernelspace memory is mapped more linearly, I don't know
<tuxd3v>
maybe you are doing a bunch of syscalls in userspace
<megi>
no syscalss
<tuxd3v>
5800% faster using SIMD
<tuxd3v>
but and the latency? between executions?
<tuxd3v>
in any case 5800% is amazing..
<megi>
both runs were in kernelspace with no preemption
<megi>
I was surprised too
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<tuxd3v>
megi: does pwm driver works ok in kernel 5.3 series?
<megi>
yes
<tuxd3v>
ok, I was to think in develop it, but I was late some 6 months :(
<tuxd3v>
nice its done..
<anarsoul>
megi: sounds like alignment issue to me
<megi>
you mean H6 PWM?
<tuxd3v>
yes
<megi>
I don't know about that :)
<megi>
I think I saw some patches
<megi>
posted to the ML
<anarsoul>
1.2ms vs 800ms means something's really wrong
<megi>
anarsoul: it might be
<anarsoul>
even 58ms to 800ms is a lot
<megi>
I actually made sure it's aligned in kernel space to 256bits
<megi>
but not in userspace
<anarsoul>
likely you can an exception, context switch to kernel, kernel fixes it up for you, switch back to userspace
<anarsoul>
s/can/get
<megi>
Linux kernel does that?
<anarsoul>
it did that for old CPUs that supported only aligned memory access, it also fixes up some dropped instructions on newer CPUs
<megi>
ha cat /proc/cpu/alignment
<megi>
if it happens, it would be reported there
<megi>
but I think this may be something else, sice malloc would guarantee some alignment, but it may not be optimal for SIMD
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<megi>
just tried, and no counters in /proc/cpu/alignment increase, and since it's a larger memory block, malloc in musl allocates it via mmap dreictly and returns a page aligned address
<megi>
directly
<megi>
interestingly, after adding 1 to the address, so that it's misaligned, still makes it run, just slower and no counters increase either
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<megi>
SIMD on Cortex-A8 will not trap on unaligned access, so that's why it doesn't show in /proc/cpu/alignment
<karlp>
libv: any idea why "save changes" on the wiki is just.... doing nothing? It spins for a bit and leaves me on the editor with no feedback on what went wrong
<karlp>
nvm, wasn't noticing the "test" question that had appeard at the top
<karlp>
would recommend that be in red or boxed in some way visually distinctive