Re: [PATCH v2 0/2] arm64: mte: Improve performance by explicitly disabling unwanted tag checking

[Will Deacon]

On Thu, 15 Jan 2026 15:07:16 -0800, Carl Worth wrote:
> [Thanks to Taehyun Noh from UT Austin for originally reporting this
> bug. In this cover letter, "we" refers to a collaborative effort
> between indiviuals at both Ampere Computing and UT Austin.]
> 
> We measured severe performance overhead (25-50%) when enabling
> userspace MTE and running memcached on an AmpereOne machine, (detailed
> benchmark results are provided below).
> 
> [...]

Applied TCMA1 patch to arm64 (for-next/cpufeature), thanks!

[2/2] arm64: mte: Set TCMA1 whenever MTE is present in the kernel
      https://git.kernel.org/arm64/c/a4e5927115f3

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
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