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

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Message-ID: <Z8mKDZOI5Q3XRtCp@gmail.com>
Date: Thu, 6 Mar 2025 12:42:05 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Eric Biggers <ebiggers@...nel.org>
Cc: x86@...nel.org, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, Ard Biesheuvel <ardb@...nel.org>,
	Ben Greear <greearb@...delatech.com>,
	Xiao Liang <shaw.leon@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>,
	"Jason A . Donenfeld" <Jason@...c4.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC PATCH v2] x86/fpu: make kernel-mode FPU reliably usable in
 softirqs


* Eric Biggers <ebiggers@...nel.org> 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