| 2 Dec 2025 |
 niklaskorz | if you mainly need it for Proton games you can use the PROTON_CPU_TOPOLOGY environment variable to force them to run on the big cache cores | 15:34:37 |
| niklaskorz | on that note, thanks for the great work, I've been studying it a bit over the past week and it's a great resource | 15:37:11 |
 Sean | hmm interesting. mind sharing? I also have 3D cache but I've been using lavd | 15:49:21 |
| niklaskorz | for the 7950X3D it's PROTON_CPU_TOPOLOGY = "16:0,1,2,3,4,5,6,7,16,17,18,19,20,21,22,23" | 15:50:38 |
| Sean | how do I figure this out? I have the 5700x3d | 15:51:03 |
 Sandro 🐧 | yeah, that works I am very sure | 16:03:31 |
 K900 | You don't need it | 16:04:34 |
| K900 | You just have 8 cache cores | 16:04:46 |
| K900 | The 16 core X3D parts have 8 cache cores and 8 no cache cores | 16:04:55 |
| niklaskorz | but if you ever come upon a multi CCD processor with different L3 cache sizes, you can check out lstopo in the hwloc package | 16:07:59 |
| niklaskorz | I mean you can also check out lstopo right now :D | 16:11:04 |
| Sean | oh okay. thanks. should I leave amd_3d_vcache as one of the modules I manually load? | 16:11:39 |
| K900 | No | 16:12:10 |
| K900 | I have no idea where you got that but no | 16:12:10 |
| Sean | I just put it in with kvm-amd and ntsync because I thought they wouldn't be loaded otherwise | 16:12:44 |
| niklaskorz | config AMD_3D_VCACHE
tristate "AMD 3D V-Cache Performance Optimizer Driver"
depends on X86_64 && ACPI
help
The driver provides a sysfs interface, enabling the setting of a bias
that alters CPU core reordering. This bias prefers cores with higher
frequencies or larger L3 caches on processors supporting AMD 3D V-Cache
technology.
If you choose to compile this driver as a module the module will be
called amd_3d_vcache.
| 16:14:25 |
| niklaskorz | so yeah there's no need to load this module for your CPU | 16:14:31 |
| 3 Dec 2025 |
|  Gus joined the room. | 12:27:20 |
|  @zerodya:beeper.com left the room. | 12:36:17 |
 gshpychka | Download IMG_2496.MOV | 16:55:12 |
| gshpychka | hey guys. I'm having trouble to set up jovian with my Nvidia GPU - image is broken (different kinds of artifacts/glitching). This is only in Gamescope - when launching big picture and/or games from Plasma (i.e. desktop mode), there are no artifacts.
I've searched through here and apparently it should be working out of the box, so I must be doing something wrong...
I'm using 580 drivers with open kernel modules, my display is a 4k@144 HDR VRR panel. It happens with any resolution I choose in gamescope, with or without HDR (I don't know how to turn off VRR, though).
Here is my config: https://github.com/gshpychka/dotfiles/blob/main/machines/reaper/jovian/default.nix
https://github.com/gshpychka/dotfiles/blob/main/machines/reaper/nvidia.nix
| 16:55:31 |
| gshpychka | * hey guys. I'm having trouble with getting gamescope on jovian working with my Nvidia GPU - image is broken (different kinds of artifacts/glitching). This is only in Gamescope - when launching big picture and/or games from Plasma (i.e. desktop mode), there are no artifacts.
I've searched through here and apparently it should be working out of the box, so I must be doing something wrong...
I'm using 580 drivers with open kernel modules, my display is a 4k@144 HDR VRR panel. It happens with any resolution I choose in gamescope, with or without HDR (I don't know how to turn off VRR, though).
Here is my config: https://github.com/gshpychka/dotfiles/blob/main/machines/reaper/jovian/default.nix
https://github.com/gshpychka/dotfiles/blob/main/machines/reaper/nvidia.nix
| 16:56:34 |
| K900 | #Jovian Experiments — NixOS on your Steam Deck, and other x86 gaming devices | 17:01:57 |
| K900 | But also gamescope on raw Nvidia is not exactly well supported | 17:02:05 |
| gshpychka | K900: sure, but to what extent? I'm not ready to give up just yet | 17:19:29 |
| K900 | To an extent where upstream doesn't care and I don't have hardware to test | 17:21:58 |
| gshpychka | that doesn't tell me much about what it means in practice in terms of effort required to make it work and whether its a hopeless endeavor or worth pursuing | 17:24:33 |
| K900 | I don't know | 17:25:05 |
| gshpychka | cool. hoping someone else will | 17:25:51 |
| gshpychka | niklaskorz: this gives me hope. care to share your setup? GPU/drivers/display | 17:26:53 |
