dividuum

8 ms·

31.
by dividuum 2y ago
https://www.pickuplimes.com/ is pretty good.
32.
by dividuum 2y ago
Thanks for your response. Interesting. I can see that working with these restrictions. This basically also assumes the data within that memory area only has pointers to either somewhere else in that area or to static structures outside, cor
33.
by dividuum 2y ago
I honestly can’t tell if that’s an elaborate joke response or if that’s really something that works. If it does: * How do you make sure you capture all mapped memory within a process? Walking something like /proc/self/maps? *
34.
by dividuum 2y ago
Yes > TinyKVM can fork itself into copies that use copy-on-write to allow for huge workloads like LLMs to share most memory. As an example, 6GB weights required only 260MB working memory per instance, making it highly scalable.
35.
by dividuum 2y ago
You need a few syscalls: to grow your heap size (brk) or to exit your program (exit). I took a quick look at their code and here are the syscalls and arguments implemented: https://github.com/varnish/tinykvm/blob&#
36.
by dividuum 2y ago
So does the good old Quake 2 rendering API. The game exported a bunch of functions to the renderer via refimport_t and the renderer in return provided functions via refexport_t. The only visible symbol in a rendering DLL is GetRefAPI_t: ht
37.
by dividuum 2y ago
> The deprecation of OMXPlayer has been problematic for one, since I rely on some custom applications which need to be able to have some fairly precise/low latency requirements between when you tell it to start playing vs when the p
38.
by dividuum 2y ago
I operate a digital signage company based around the Pi. Curious what problems you run into. SD cards?
39.
by dividuum 2y ago
You very very likely won't be able to decode a 13660×768 video fast enough.
40.
by dividuum 2y ago
It’s not the same. They are slightly different and depending on whether you cross-eye or parallel view them, both texts will slightly move away or towards you in 3D.
41.
by dividuum 2y ago
Once you learn how to cross view, you can cheat at those „find the difference“ quizzes: Cross view them and the differences will flicker.
42.
by dividuum 2y ago
A triangle with an exclamation mark inside.
43.
Improving video rotation performance on the Pi using VPU vector instructions(community.info-beamer.com)
2 points by dividuum 2y ago|1 comments
44.
by dividuum 2y ago
Rotating videos using DRM/KMS on the Pi3 isn't trivial. I had to revert to using the VideoCore co-processor and its massive 64x64 register to improve performance to level comparable with the older firmware implementation. This blo
45.
by dividuum 2y ago
Pis VideoCore has like 48 planes split up between writeback and HDMI output CRTCs. There’s one explicit Cursor plane per CRTC.
46.
by dividuum 2y ago
Steam added a P2P caching mechanism recently and allows downloading games for other local machines that already have the game installed. Greatly helps with avoiding duplicate downloads on a steam deck, for example. I also added a similar me
47.
by dividuum 2y ago
> I dunno how much hardware abstraction there is in libdrm (and this is my own dawn fault as I should have dug deeper a long time ago in libdrm interface), do we have to "know" how to deal with the native format, or is there so
48.
by dividuum 2y ago
> The configuration validity depends on the current state of the display controller. Yep. At least now the Pi's implementation does cause kernel tracebacks or lockups any more. Was rough in the beginning :-} Flipping is supported (b
49.
by dividuum 2y ago
My main source was reading other source and sometimes asking questions in the Pi forum. The already linked kmscube shows how some of mentioned techniques work. It was then mainly following up on API calls names and parameters (DRM_MODE_ATOM
50.
by dividuum 2y ago
Right. The number of times I got an EINVAL just to discover yet another reason was quiet something :) (Is there a better way to discover the true reason other than scrolling back through dmesg?) I'm also falling back to GL composition
51.
by dividuum 2y ago
I've worked a lot this year on writing DRM/KMS code while porting my digital signage player ( https://info-beamer.com ) to support the Raspberry Pi5. Since they moved away from their proprietary Broadcom provided graphic
52.
by dividuum 2y ago
Not sure how viable that would be, but if the rotation within the game is high-res enough I imagine one might render the same scene four times each with a rotation offset equivalent to half a pixel. Then combine those to a whopping 640x400
53.
by dividuum 2y ago
Faking NUMA can help enforcing access patterns that make things faster: > In the worst case, two sdram clients accessing different pages of the same bank, may cause repeated closing and opening of the pages, harming the usable bandwidth
54.
by dividuum 2y ago
Right. I read it as "modified by Broadcom". Just wanted to point out, that this isn't inherently a bad thing if done right.
55.
by dividuum 2y ago
There is no "Broadcom-modified kernel". There's a fork with changes needed to support all Pi hardware at https://github.com/raspberrypi/linux . Unlike some boards were you're eternally stuck at old v
56.
by dividuum 2y ago
There's enet ( https://github.com/lsalzman/enet ) or something like naia ( https://github.com/naia-lib/naia ) which supposedly uses ideas from the old (but very reliable back in the day) networki
57.
by dividuum 2y ago
I was curious on how that’s supposed to work, so I took a quick look: It scans /proc for known commands, then looks up file descriptor information via their fd/fdinfo directory to get size/seek positions and then shows a perc
58.
by dividuum 2y ago
Aka Peg-DHCP (RFC 2322) - https://www.rfc-editor.org/rfc/rfc2322.txt
59.
by dividuum 2y ago
I guess it's these two files? The original 2600+ lines of C++: https://gitlab.freedesktop.org/asahi/mesa/-/blob/main/src/ga... The translated code: https://gitlab.freedesktop.or
60.
by dividuum 2y ago
What a weird thing to say. The Pi is more open source than ever. Output is controlled by DRM/KMS. Video decoding uses FFmpeg and OpenGL is now via Mesa. All of that was closed source binaries two generations ago. Kernel changes are pus

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