NVIDIA Unified Memory kernel module to load at boot

Graphics / Linux Linux
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1

Hello!

I’m trying to add the same paramaters to /etc/modprobe.d/nvidia.conf as nvidia-modbrope --unified-memory --create-nvidia-device-file=0to load at boot. Not sure what exactly to add as parameters and options to /etc/modprobe.d/nvidia.conf. Running CentOS8 with 4.18.0-240.15.1.el8_3.x86_64 kernel and TU104 [GeForce RTX 2070 SUPER] card. Perhaps I’m overthinking or going in the wrong direction. Any pointers are appreciated!

2

For autoloading modules, check /etc/modules-load.d/
Regarding device file permissions/UID/GID, please see https://download.nvidia.com/XFree86/Linux-x86_64/430.50/README/faq.html

3

Thanks for quick reply!

Do I understand correctly, the NVIDIA module autoloads the unified memory?

Realised the options regarding the device file creation. Thank you, @generix, for taking the time!
/etc/modprobe.d/nvidia.conf/
options nvidia NVreg_DeviceFileUID=0 NVreg_DeviceFileGID=0 NVreg_DeviceFileMode=0660

4

No, the uvm module doesn’t get autoloaded unless you set your OS to do so, using the modprobe config directory.

5

I’m sorry to pester, but what is the option parameter to add to the modprobe.d/nvidia.conf?
modinfo nvidia provides me with following parameters but I’m confused which one is responsible for uvm?

nvidia option parameters (click to expand) 
parm:           NvSwitchBlacklist:NvSwitchBlacklist=uuid[,uuid...] (charp)
parm:           nv_cap_enable_devfs:Enable (1) or disable (0) nv-caps devfs support. Default: 1 (int)
parm:           NVreg_ResmanDebugLevel:int
parm:           NVreg_RmLogonRC:int
parm:           NVreg_ModifyDeviceFiles:int
parm:           NVreg_DeviceFileUID:int
parm:           NVreg_DeviceFileGID:int
parm:           NVreg_DeviceFileMode:int
parm:           NVreg_InitializeSystemMemoryAllocations:int
parm:           NVreg_UsePageAttributeTable:int
parm:           NVreg_RegisterForACPIEvents:int
parm:           NVreg_EnablePCIeGen3:int
parm:           NVreg_EnableMSI:int
parm:           NVreg_TCEBypassMode:int
parm:           NVreg_EnableStreamMemOPs:int
parm:           NVreg_EnableBacklightHandler:int
parm:           NVreg_RestrictProfilingToAdminUsers:int
parm:           NVreg_PreserveVideoMemoryAllocations:int
parm:           NVreg_EnableS0ixPowerManagement:int
parm:           NVreg_S0ixPowerManagementVideoMemoryThreshold:int
parm:           NVreg_DynamicPowerManagement:int
parm:           NVreg_DynamicPowerManagementVideoMemoryThreshold:int
parm:           NVreg_EnableUserNUMAManagement:int
parm:           NVreg_MemoryPoolSize:int
parm:           NVreg_KMallocHeapMaxSize:int
parm:           NVreg_VMallocHeapMaxSize:int
parm:           NVreg_IgnoreMMIOCheck:int
parm:           NVreg_NvLinkDisable:int
parm:           NVreg_EnablePCIERelaxedOrderingMode:int
parm:           NVreg_RegisterPCIDriver:int
parm:           NVreg_RegistryDwords:charp
parm:           NVreg_RegistryDwordsPerDevice:charp
parm:           NVreg_RmMsg:charp
parm:           NVreg_GpuBlacklist:charp
parm:           NVreg_TemporaryFilePath:charp

Edit: formatting

6

There are no nvidia-uvm specific settings, its device files are created with the same permissions you set for the nvidia module.

7

Thanks for clarifying! In the end, went with the simplest solution and added a cron job to load the unfied memory kernel module:
@reboot /usr/bin/nvidia-modprobe --unified-memory --create-nvidia-device-file=0 >> /var/log/nvidia-boot.log 2>&1
Thanks again and all the best!