From: Herbert Xu <herbert@gondor.apana.org.au>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@kernel.org>,
Eric Biggers <ebiggers@kernel.org>,
Mark Brown <broonie@kernel.org>,
linux-crypto@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>, Dave Martin <dave.martin@arm.com>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [RFC PATCH 0/5] running kernel mode SIMD with softirqs disabled
Date: Sat, 19 Dec 2020 13:04:33 +1100 [thread overview]
Message-ID: <20201219020433.GA11077@gondor.apana.org.au> (raw)
In-Reply-To: <20201218170106.23280-1-ardb@kernel.org>
On Fri, Dec 18, 2020 at 06:01:01PM +0100, Ard Biesheuvel wrote:
>
> Questions:
> - what did I miss or break horribly?
> - does any of this matter for RT? AIUI, RT runs softirqs from a dedicated
> kthread, so I don't think it cares.
> - what would be a reasonable upper bound to keep softirqs disabled? I suppose
> 100s of cycles or less is overkill, but I'm not sure how to derive a better
> answer.
> - could we do the same on x86, now that kernel_fpu_begin/end is no longer
> expensive?
If this approach works not only would it allow us to support the
synchronous users better, it would also allow us to remove loads
of cruft in the Crypto API that exist solely to support these SIMD
code paths.
So I eagerly await the assessment of the scheduler/RT folks on this
approach.
Thanks,
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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next prev parent reply other threads:[~2020-12-19 2:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-18 17:01 [RFC PATCH 0/5] running kernel mode SIMD with softirqs disabled Ard Biesheuvel
2020-12-18 17:01 ` [RFC PATCH 1/5] crypto: aead - disallow en/decrypt for non-task or non-softirq context Ard Biesheuvel
2020-12-18 17:01 ` [RFC PATCH 2/5] crypto: skcipher " Ard Biesheuvel
2020-12-18 17:01 ` [RFC PATCH 3/5] crypto: arm64/gcm-aes-ce - add NEON yield support Ard Biesheuvel
2020-12-18 17:01 ` [RFC PATCH 4/5] arm64: fpsimd: run kernel mode NEON with softirqs disabled Ard Biesheuvel
2021-01-19 16:00 ` Dave Martin
2021-01-19 16:29 ` Ard Biesheuvel
2021-01-20 15:44 ` Dave Martin
2021-02-15 18:30 ` Ard Biesheuvel
2020-12-18 17:01 ` [RFC PATCH 5/5] crypto: arm64/gcm-aes-ce - remove non-SIMD fallback path Ard Biesheuvel
2020-12-19 2:04 ` Herbert Xu [this message]
2021-01-14 8:22 ` [RFC PATCH 0/5] running kernel mode SIMD with softirqs disabled Ard Biesheuvel
2021-02-16 10:09 ` Peter Zijlstra
2021-02-16 10:35 ` Ard Biesheuvel
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