| Summary: | GPU VRAM sensor reports erratic values | ||
|---|---|---|---|
| Product: | [Applications] plasma-systemmonitor | Reporter: | Bandit <bandit> |
| Component: | general | Assignee: | KSysGuard Developers <ksysguard-bugs> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | ahiemstra, kde, nate, plasma-bugs-null |
| Priority: | NOR | ||
| Version First Reported In: | 6.4.5 | ||
| Target Milestone: | --- | ||
| Platform: | Arch Linux | ||
| OS: | Linux | ||
| Latest Commit: | https://invent.kde.org/plasma/ksystemstats/-/commit/fc8120f7500c3bfac1de23b6dc5d53e9eb34de06 | Version Fixed In: | 6.5.0 |
| Sentry Crash Report: | |||
|
Description
Bandit
2025-10-12 07:28:45 UTC
So seems we are wrong by factor 10 approximately? Can you give me your driver version and a few samples of 'nvidia-smi dmon -c 2 -s pucm' thanks ! Hello. Here the requested Info (I hope i did it right):
NVIDIA-SMI 580.95.05 Driver Version: 580.95.05 CUDA Version: 13.0
nvidia-smi dmon -c 2 -s pucm
# gpu pwr gtemp mtemp sm mem enc dec jpg ofa mclk pclk fb bar1 ccpm
# Idx W C C % % % % % % MHz MHz MB MB MB
0 21 56 - 22 27 0 0 0 0 810 450 2594 2630 0
1 16 45 - 0 0 0 0 0 0 405 210 18 19 0
0 21 56 - 26 29 0 0 0 0 405 405 2594 2630 0
1 16 45 - 0 0 0 0 0 0 405 210 18 19 0
and with some load on it:
nvidia-smi dmon -c 2 -s pucm
# gpu pwr gtemp mtemp sm mem enc dec jpg ofa mclk pclk fb bar1 ccpm
# Idx W C C % % % % % % MHz MHz MB MB MB
0 53 64 - 4 3 0 0 0 0 7301 1965 9061 9097 0
1 85 48 - 0 0 0 0 0 0 9251 1725 6468 6468 0
0 46 63 - 4 3 0 0 0 0 7301 1807 9061 9097 0
1 86 48 - 0 0 0 0 0 0 9251 1725 6468 6468 0
On load btop says
GPU0 9,1G / 12G
GPU1 6,7G / 10G
If you need more let me know.
Thank you for looking into it.
It seems like we add fb and bar1 together which results in which means we show ~double the amount in your case. It doesnt explain the tenfold increase that you saw earlier through. A possibly relevant merge request was started @ https://invent.kde.org/plasma/ksystemstats/-/merge_requests/115 Git commit 3c929b0113d356e3242b75a6ef9e0ba962ebe44b by David Redondo. Committed on 14/10/2025 at 08:41. Pushed by davidre into branch 'master'. gpu/nvidia: Only count fb memory This matches what nvidia-settings does to show used memory. In some cases bar can be as high as fb causing wildly incorrect readings. FIXED-IN:6.5 M +3 -3 plugins/gpu/NvidiaSmiProcess.cpp M +3 -3 plugins/gpu/autotests/nvidia.cpp https://invent.kde.org/plasma/ksystemstats/-/commit/3c929b0113d356e3242b75a6ef9e0ba962ebe44b Git commit fc8120f7500c3bfac1de23b6dc5d53e9eb34de06 by David Redondo. Committed on 16/10/2025 at 08:20. Pushed by davidre into branch 'Plasma/6.5'. gpu/nvidia: Only count fb memory This matches what nvidia-settings does to show used memory. In some cases bar can be as high as fb causing wildly incorrect readings. FIXED-IN:6.5 (cherry picked from commit 3c929b0113d356e3242b75a6ef9e0ba962ebe44b) Co-authored-by: David Redondo <kde@david-redondo.de> M +3 -3 plugins/gpu/NvidiaSmiProcess.cpp M +3 -3 plugins/gpu/autotests/nvidia.cpp https://invent.kde.org/plasma/ksystemstats/-/commit/fc8120f7500c3bfac1de23b6dc5d53e9eb34de06 |