Re: [RFC PATCH v2] x86/fpu: make kernel-mode FPU reliably usable in softirqs

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Subject: Re: [RFC PATCH v2] x86/fpu: make kernel-mode FPU reliably usable in softirqs
From: Ingo Molnar <mingo@xxxxxxxxxx>
Date: Thu, 6 Mar 2025 12:42:05 +0100
Cc: x86@xxxxxxxxxx, linux-crypto@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Ard Biesheuvel <ardb@xxxxxxxxxx>, Ben Greear <greearb@xxxxxxxxxxxxxxx>, Xiao Liang <shaw.leon@xxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, "Jason A . Donenfeld" <Jason@xxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <20250305203018.GB19889@sol.localdomain>
References: <20250304204954.3901-1-ebiggers@kernel.org> <Z8gUYamgBr4M5ZaB@gmail.com> <20250305173925.GA4014401@google.com> <Z8iTSzfzrFLv-JBL@gmail.com> <20250305203018.GB19889@sol.localdomain>

* Eric Biggers <ebiggers@xxxxxxxxxx> wrote:

> Deleting the ldmxcsr(MXCSR_DEFAULT) adds about 14 MB/s.

BTW., that's still a +3% performance improvement, so it is worth 
considering in addition to the current patch IMO.

Thanks,

	Ingo

References:
- [RFC PATCH v2] x86/fpu: make kernel-mode FPU reliably usable in softirqs
  - From: Eric Biggers
- Re: [RFC PATCH v2] x86/fpu: make kernel-mode FPU reliably usable in softirqs
  - From: Ingo Molnar
- Re: [RFC PATCH v2] x86/fpu: make kernel-mode FPU reliably usable in softirqs
  - From: Eric Biggers
- Re: [RFC PATCH v2] x86/fpu: make kernel-mode FPU reliably usable in softirqs
  - From: Ingo Molnar
- Re: [RFC PATCH v2] x86/fpu: make kernel-mode FPU reliably usable in softirqs
  - From: Eric Biggers

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