Uninstalling / disabling

[devedse]

Hello everyone,

Pardon me for maybe being a noob in DKMS modules, but for testing purposes on my machine I'd like to completely disable the sr-iov module. (From what I read is that I don't actually need this for hardware acceleration inside LXC containers).

So I'm looking for a guide to either completely uninstall it, or maybe a simpler version, to temporarily disable it.
(I can try some things myself but I want to know if for example modifying the boot parameters is good enough to disable it or if I should also uninstall the DKMS module)

[devedse]

Copied from another post (#137 (comment)):

brussig-tud

Just dkms remove'ing the module will be enough to disable virtual functions temporarily. I did not have to do anything else to get rid of the memory leak, which pretty much proves that the i915-sriov driver is the culprit. You can always just dkms install it again later on if you need virtual functions back.

devedse

So I don't need to remove this from grub?:
intel_iommu=on i915.enable_guc=3 i915.max_vfs=7

And also don't need to remove this file:
/etc/sysfs.conf

brussig-tud

@devedse The "vanilla" i915 driver will ignore the max_vfs kernel boot parameter, and the sysfs entry will just silently fail if the driver does not provide the endpoints, so yeah, you can leave them in place.

I don't remember whether just not creating VFs via sysfs was enough to fix the memory leak, or if you also had to set max_vfs=0, or if you had to completely disable GuC scheduling altogether (which should also cause this driver to not leak memory). You can try narrowing it down further like this, but removing the DKMS module will surely prove or disprove the hypothesis that this driver is causing your memory leak and you can leave the other things there in case you need them later.

[devedse]

Apparently after the dkms remove you also need to reinstall the kernel since the "i915.ko" module has been removed.

I did this as follows:

dpkg --search /usr/lib/modules/<kernel version directory>

apt-get --reinstall install proxmox-kernel-6.5.13-1-pve-signed