arilou

Linux (Fedora 35) on a Thinkpad P14s [T14] Gen2 AMD

These are my installation-tricks and notes for running Linux on a 2021 Thinkpad P14s Gen2 with AMD Ryzen 7 5850U. It should also be suitable for the Thinkpad T14 Gen2 AMD as they are technically the same modell.
Meanwhile there is also a good test on youtube and an entry in the arch-wiki, which also comments some points mentioned here.

Detailed specs

Shipped:

Why do you prefer [Borg] over [git-lfs]/[git-annex]?

GitHub LFS has a 2GB limit on file size. This never works with large projects like video productions.
git-annex uses symlinks to manage annexed files. This doesn't work well on Windows.

So my conclusion at the moment is that Borg is the best backup software for mid/large-sized personal projects.

Tracing QEMU-KVM Interactions

But default in linux you can figure out how many times and for what reasons there is a VM Exit from a VM into the kvm kernel module. However given the ubiquity of vhost and the ability of kvm to emulate most device models directly in the kernel, most of those VM exits do not result in a transition from host kernel into the QEMU. The transitions from VM -> kvm -> QEMU are typically the most expensive.

Here we try to figure out how many of the VM Exits result in the invocation of QEMU.

Tracking VM-KVM Interactions

This can be done very simply with perf

	#!/bin/sh
	export GIT_SSH_COMMAND='ssh -o ProxyCommand="connect -S 127.0.0.1:1080 %h %p"'
	git config --global core.sshCommand 'ssh -o ProxyCommand="connect -S 127.0.0.1:1080 %h %p"'

	git clone -c=core.sshCommand 'ssh -o ProxyCommand="connect -S 127.0.0.1:1080 %h %p"' git@github.com:larryli/ipv4.git
	git config core.sshCommand 'ssh -o ProxyCommand="connect -S 127.0.0.1:1080 %h %p"'

	#region Set-ProcMonAltitude
	function Set-ProcMonAltitude {
	[CmdletBinding()]
	PARAM(
	[Parameter(Mandatory = $false, Position = 0)]
	[int32[]]
	$Version = @(23, 24)
	,
	[Parameter(Mandatory = $false, Position = 1)]
	[int32[]]