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AMD's Ryzen Will Really Like A Newer Linux Kernel Written by Michael Larabel in AMD on 26 February 2017 at 08:57 PM EST. 67 Comments

AMD's Ryzen CPU is finally shipping in a few days! If you are planning to be an early adopter of AMD Ryzen processors, you will really want to be running a newer Linux kernel release for proper support and performance.

AMD Ryzen launch on 2 March.

As I wrote about back in December, Linux 4.10 landed a lot of Zen/Ryzen code. So with Linux 4.10 looks to be -- and reaffirmed by this trusted confidant -- a good point for AMD Ryzen testing and usage.

was pointed out in particular to this kernel commit that only landed in early February: "x86/CPU/AMD: Fix Zen SMT topology." It notes in the commit message, "After: a33d331761bc ("x86/CPU/AMD: Fix Bulldozer topology") our SMT scheduling topology for Fam17h systems is broken, because the ThreadId is included in the ApicId when SMT is enabled. So, without further decoding cpu_core_id is unique for each thread rather than the same for threads on the same core. This didn't affect systems with SMT disabled. Make cpu_core_id be what it is defined to be." That mentioned regression was introduced only in January but had been pulled back into stable kernel point releases from Linux 4.6 and newer. This fix for the (Ry)zen SMT topology is in Linux 4.10 and was back-ported to Linux 4.9.10+ for those still riding the 4.9 kernel. https://phoronix.com/scan.php?page=news_item&px=AMD-Ryzen-Newer-Kernel