DuatDweller on 30/7/2026 at 00:07

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Linux CPU Driver Patches Massively Reduce Game Stuttering on steam deck

(https://www.techpowerup.com/351189/linux-cpu-driver-patches-massively-reduce-game-stuttering-on-steam-deck)

In recent years, community-supported work on components like drivers and kernel improvements have made Linux distributions like SteamOS especially viable as gaming operating systems. Now, a new set of driver patches has been shared to the Linux kernel mailing list, and the developer behind the patches, David Vernet, claims to have improved 1% lows on AMD CPUs by as much as 31%. The new patches, which introduce the epp_boost feature to the AMD P-State driver, aim to improve CPU performance by improving CPU scaling and CPU boost behavior through identifying busy cores and enabling EPP boost on a per-core basis as needed. As per the explanation in the Linux kernel mailer:

When the epp_boost module parameter is enabled, an update-util hook samples each core's C0 residency (delta MPERF over delta TSC) at most once every 10 ms. If a sample shows the core at least 50% busy, the EPP field of its MSR_AMD_CPPC_REQ is set to performance (0) and held there until 300 ms pass without another busy sample, at which point the hook restores the request that policy management last stored in cppc_req_cached.

The goal with epp_boost is to achieve similar results to the global EPP boost state without the efficiency penalty of locking the cores in a high performance mode. This also means that it will likely result in more FPS gains the more a game is CPU-bound. This was the case in the developer's own testing on a Valve Steam Deck, with Civilization VI's canned benchmark resulting in 31.8% improvements to 1%-low frame rates and 4.1% faster p99 frame times. Currently, the patches have not yet been implemented, as they need to be reviewed by AMD's kernel engineers. The patch series even manages to outperform the native global EPP boost state, which only improved 1% lows by 16%.