Idea to reduce latency

[vjbaker88]

Hi

Thanks for your work.
To reduce lantency (audio overhead) did you try to use RT kernel (ex: preempt rt) or Desktop low latency in kernel options ?
Did you try to replace alsa by jackd 2 server or tune pulseaudio paramaters ?

PS: where is defined retro-core-image ? i didn't find .bb file like other images.

Regards

[dev-0x7C6]

Hi,

To reduce lantency (audio overhead) did you try to use RT kernel (ex: preempt rt) or Desktop low latency in kernel options ?

Neither of them, but I'm on it. I'll try with yocto-linux-rt for intel machine and probably something for raspberry.

Did you try to replace alsa by jackd 2 server or tune pulseaudio paramaters ?

Only with stock pulseaudio configuration. I never tried jack I wonder can it coexists with pulseaudio without tons of configuration? I'll read on the matter.

Recently I was messing with retroarch configuration. I changed default 64ms audio latency to 256ms with
RETROARCH_CONFIG_AUDIO_LATENCY variable. This results with better performance for some emulators for lower end sbc's. Not sure if this was a good choice in general.

PS: where is defined retro-core-image ? i didn't find .bb file like other images.

Here: retro-core-image.bbclass it's defined as template for retro-image-full, retro-image-standard and retro-image-minimal

What is your current sbc that you're working on?

Cheers

[vjbaker88]

I'm working on Raspberry pi 3 and 4.
I'm trying to compile pi3 (32 and 64 bits) minimal image.
I'm blocked on compilation with LLVM 10 or spirv tools. Are you sure that Mesa - Gallium LLVM is not in conflict for raspberry ?

[dev-0x7C6]

I'm working on Raspberry pi 3 and 4.
I'm trying to compile pi3 (32 and 64 bits) minimal image.

I'm using retro-build-environment for my rpi 3/4 builds, may come handy.

I'm blocked on compilation with LLVM 10 or spirv tools. Are you sure that Mesa - Gallium LLVM is not in conflict for raspberry ?

You can share an error log (with verbose logs on) maybe I'll be able to help. I'm not 100% sure but I think that llvm gallium is not needed for raspberry so you can disable it to avoid dependencies.

Are you using my distribution configuration? (retro.conf) - if yes there is RETRO_ADDITIONAL_MESA_GPUS variable to specified what append additionally (take note that is only adding to mesa configuration and living it empty will not remove some defaults). You can override this from local.conf

In recent commit a4f1ae5 I've added linux-raspberrypi-rt kernel (5.4.72 with RT patches, and configuration that enabling preempt rt)

I can be set in local.conf like that: PREFERRED_PROVIDER_virtual/kernel = "linux-raspberrypi-rt"

[dev-0x7C6]

In recent commit a4f1ae5 I've added linux-raspberrypi-rt kernel (5.4.72 with RT patches, and configuration that enabling preempt rt)
I can be set in local.conf like that: PREFERRED_PROVIDER_virtual/kernel = "linux-raspberrypi-rt"

I'm moving kernels and other recipes specific to raspberrypi to separate meta-raspberrypi-extras layer.

[vjbaker88]

Hello

This is the error that i meet when i'm compiling spirv-tools.
I m using a rpi3-64, is there a way in retroarch.inc to choose kms and opengles ?
It seems that glslang is enabled and so spirv-tools is needed.

Regards

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| FAILED: test/opt/CMakeFiles/test_opt.dir/fold_test.cpp.o
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| {standard input}: Assembler messages:
| {standard input}:2388687: Warning: end of file not at end of a line; newline inserted
| {standard input}:2388988: Error: symbol `.LVU5319' is already defined
| {standard input}: Error: open CFI at the end of file; missing .cfi_endproc directive
| aarch64-poky-linux-g++: fatal error: Killed signal terminated program cc1plus
| compilation terminated.

[vjbaker88]

On spirv-tools git, there is an update since 2 days to correct VUID label.
I'm checking.

[dev-0x7C6]

This is the error that i meet when i'm compiling spirv-tools.

I'm using default version from meta-oe/poky which is spirv-tools 2020.5 (for master branch) right now. Did you switched to git version because of compilation problem? Maybe it's good idea to revert to default one?

is there a way in retroarch.inc to choose kms and opengles ?

Defaults are here: retroarch-config.inc

kms with opengl (es) is set by default. I recommend to stay with default configuration provided by recipe. I'm using kms back-end on couple of sbc and intel machines with this configuration.

{standard input}:2388988: Error: symbol `.LVU5319' is already defined

Unfortunately I don't know how to deal with that one. Looks like linker problem but why is this I do not know. I'll try to build for raspberrypi3-64 with I'll report shortly what outcome is. (I'm using retro-build-environment)

On spirv-tools git, there is an update since 2 days to correct VUID label.

Give it a try, but I think it's better to stay with released/stable version.

[dev-0x7C6]

~/.../yocto/master/retro-build-environment ⑂master* $ MACHINE="raspberrypi3-64" bitbake retro-image-full
Loading cache: 100% |########################################################################################################################################################################################################################| Time: 0:00:00
Loaded 4360 entries from dependency cache.
Parsing recipes: 100% |######################################################################################################################################################################################################################| Time: 0:00:03
Parsing of 2964 .bb files complete (2803 cached, 161 parsed). 4470 targets, 363 skipped, 0 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies

Build Configuration:
BB_VERSION           = "1.49.0"
BUILD_SYS            = "x86_64-linux"
NATIVELSBSTRING      = "universal"
TARGET_SYS           = "aarch64-poky-linux"
MACHINE              = "raspberrypi3-64"
DISTRO               = "retro"
DISTRO_VERSION       = "3.2+snapshot-20201107"
TUNE_FEATURES        = "aarch64 armv8a crc cortexa53"
TARGET_FPU           = ""
meta-dev1990         = "master:a1d6c798d027b89c24537d4b43a835af4bb39875"
meta-intel           = "HEAD:3cf8482e432e5daf0b75394152e2c229b3a08d36"
meta-kodi            = "master-next:1bb0e6aa6a7008aa16a27e86e66fbce59b269d7d"
meta-mesa            = "master:7470c62fa9d9f537c734ce4f2dec9f249fae8746"
meta-meson           = "master:2cb8fcf6679fc3c1d0f07279413a4f7a20203534"
meta-multimedia      
meta-networking      
meta-oe              
meta-python          = "HEAD:1204ed0a0efa600d07cea7dd78036f051e44f107"
meta-python2         = "HEAD:c43c29e57f16af4e77441b201855321fbd546661"
meta-qt5             = "HEAD:6557244eca22a8722cf0fde2f3cc62f45cb72651"
meta-raspberrypi     = "HEAD:15739db1ed469babe6cd162f0c100cae50919dcd"
meta-raspberrypi-extras = "HEAD:ee0c01f9169360736a4ac061739cf914bf9f79e0"
meta-rauc            = "HEAD:8e049699f05483b694e6c5a3e260cd9e0fe58d2e"
meta-rauc-raspberrypi = "autogrow-fs:8273fad07c49d276e2963976f5911f84a8e4de32"
meta-retro           = "master:28bed52815d695dd40ccf9e5771b566702782c97"
meta-sunxi           = "HEAD:370007f1c8694b7fd1847287ad66d9916581540c"
meta                 
meta-poky            
meta-yocto-bsp       = "master:1ad28364512be087f35b7cac6f6289027c070767"

Initialising tasks: 100% |###################################################################################################################################################################################################################| Time: 0:00:09
Sstate summary: Wanted 745 Found 744 Missed 1 Current 2540 (99% match, 99% complete)
NOTE: Executing Tasks
NOTE: Tasks Summary: Attempted 8988 tasks of which 8966 didn't need to be rerun and all succeeded.

I was able to build retro-image-full for raspberrypi3-64 without any errors.

I'm using dev-0x7C6/retro-build-environment@40aa9c9

[vjbaker88]

Thanks for the research. I'm using dunfell branch which seems to be outdated since 1 month.

Layer openembedded-layer is not compatible with the core layer which only supports these series: dunfell (layer is compatible with hardknott gatesgarth)