From: Eric Biggers <ebiggers@kernel.org>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Jakub Kicinski <kuba@kernel.org>,
fsverity@lists.linux.dev, linux-crypto@vger.kernel.org,
dm-devel@lists.linux.dev, x86@kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Ard Biesheuvel <ardb@kernel.org>,
Sami Tolvanen <samitolvanen@google.com>,
Alasdair Kergon <agk@redhat.com>,
Mike Snitzer <snitzer@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Mikulas Patocka <mpatocka@redhat.com>,
David Howells <dhowells@redhat.com>,
netdev@vger.kernel.org
Subject: Re: [PATCH v8 0/7] Optimize dm-verity and fsverity using multibuffer hashing
Date: Sat, 15 Feb 2025 19:26:16 -0800 [thread overview]
Message-ID: <20250216032616.GA90952@quark.localdomain> (raw)
In-Reply-To: <Z7FM9rhEA7n476EJ@gondor.apana.org.au>
On Sun, Feb 16, 2025 at 10:27:02AM +0800, Herbert Xu wrote:
> On Sat, Feb 15, 2025 at 09:04:12AM -0800, Jakub Kicinski wrote:
> >
> > Can confirm, FWIW. I don't know as much about IPsec, but for TLS
> > lightweight SW-only crypto would be ideal.
>
> Please note that while CPU-only crypto is the best for networking,
> it actually operates in asynchronous mode on x86. This is because
> RX occurs in softirq context, which may not be able to use SIMD on
> x86.
Well, the async fallback (using cryptd) occurs only when a kernel-mode FPU
section in process context is interrupted by a hardirq and at the end of it a
softirq also tries to use kernel-mode FPU. It's generally a rare case but also
a terrible implementation that is really bad for performance; this should never
have been implemented this way. I am planning to fix it so that softirqs on x86
will always be able to use the FPU, like they can on some of the other arches
like arm64 and riscv.
- Eric
next prev parent reply other threads:[~2025-02-16 3:26 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20250212154718.44255-1-ebiggers@kernel.org>
2025-02-13 4:17 ` [PATCH v8 0/7] Optimize dm-verity and fsverity using multibuffer hashing Herbert Xu
2025-02-13 6:33 ` Eric Biggers
2025-02-14 2:44 ` Herbert Xu
2025-02-14 3:35 ` Eric Biggers
2025-02-14 3:50 ` Herbert Xu
2025-02-14 4:29 ` Eric Biggers
2025-02-14 4:56 ` Herbert Xu
2025-02-14 6:11 ` Eric Biggers
2025-02-14 10:50 ` Ard Biesheuvel
2025-02-15 17:04 ` Jakub Kicinski
2025-02-16 2:27 ` Herbert Xu
2025-02-16 3:26 ` Eric Biggers [this message]
2025-02-16 3:29 ` Herbert Xu
2025-02-17 17:40 ` Jakub Kicinski
2025-02-18 3:42 ` Herbert Xu
2025-02-18 7:41 ` Ard Biesheuvel
2025-02-18 8:02 ` Herbert Xu
2025-02-13 10:10 ` Ard Biesheuvel
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