The L3 finding on Linux is likely caused by the C3 entry cache flush, which goes away in our upcoming 6.1 kernel. It doesn't affect most game workloads but can be a real performance problem in some specific cases.
https://lore.kernel.org/lkml/CAJZ5v0jWX=H=aZ25PzHdH05bRJvtYb...
The way the benchmark works likely triggers it consistently.
For those who don’t know, plagman is a Valve employee and the creator (?) of gamescope.
Cool to see you here. Gamescope is awesome.
For those that don't know (like me, three minutes ago) gamescope [1] is a Wayland compositor custom-written for games (and, I believe, what the Steam Deck uses). it's open source, and under the "BSD 2-clause" license.