linux-kernel - Re: [PATCH v2 0/9] crypto: x86

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Message-ID: <Z-344xAsx1uTE9OK@gondor.apana.org.au>
Date: Thu, 3 Apr 2025 10:56:35 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Eric Biggers <ebiggers@...nel.org>
Cc: Ard Biesheuvel <ardb@...nel.org>, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	"Jason A. Donenfeld" <Jason@...c4.com>
Subject: Re: [PATCH v2 0/9] crypto: x86 - stop using the SIMD helper

On Thu, Apr 03, 2025 at 02:14:53AM +0000, Eric Biggers wrote:
>
> It's not the 90s anymore.  Crypto is fast now, and used ubiquitously.

I have to say that you've done a great job in improving crypto
performance on x86 and I'm very pleased with being able to
encrypt 256 bytes in just over 100 CPU cycles and doing a
whole page takes less than 1000 cycles.

But this is only possible with SIMD instructions which we do not
support in hard IRQ context.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt