Development discussion of WireGuard
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From: Geert Uytterhoeven <geert@linux-m68k.org>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
	netdev <netdev@vger.kernel.org>,
	wireguard@lists.zx2c4.com,
	 Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>,  Theodore Tso <tytso@mit.edu>,
	Greg KH <gregkh@linuxfoundation.org>,
	 jeanphilippe.aumasson@gmail.com,
	Ard Biesheuvel <ardb@kernel.org>,
	 Herbert Xu <herbert@gondor.apana.org.au>
Subject: Re: [PATCH crypto 1/2] lib/crypto: blake2s-generic: reduce code size on small systems
Date: Wed, 12 Jan 2022 11:57:49 +0100	[thread overview]
Message-ID: <CAMuHMdWOheM0WsHNTA2dS=wJA8kXEYx6G78bnZ51T1X8HWdzNg@mail.gmail.com> (raw)
In-Reply-To: <20220111134934.324663-2-Jason@zx2c4.com>

Hi Jason,

On Tue, Jan 11, 2022 at 2:49 PM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
> Re-wind the loops entirely on kernels optimized for code size. This is
> really not good at all performance-wise. But on m68k, it shaves off 4k
> of code size, which is apparently important.

On arm32:

add/remove: 1/0 grow/shrink: 0/1 up/down: 160/-4212 (-4052)
Function                                     old     new   delta
blake2s_sigma                                  -     160    +160
blake2s_compress_generic                    4872     660   -4212
Total: Before=9846148, After=9842096, chg -0.04%

On arm64:

add/remove: 1/2 grow/shrink: 0/1 up/down: 160/-4584 (-4424)
Function                                     old     new   delta
blake2s_sigma                                  -     160    +160
e843419@0710_00007634_e8a0                     8       -      -8
e843419@0441_0000423a_178c                     8       -      -8
blake2s_compress_generic                    5088     520   -4568
Total: Before=32800278, After=32795854, chg -0.01%

> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

For the size reduction:
Tested-by: Geert Uytterhoeven <geert@linux-m68k.org>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

  reply	other threads:[~2022-01-16 21:10 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CAHmME9qbnYmhvsuarButi6s=58=FPiti0Z-QnGMJ=OsMzy1eOg@mail.gmail.com>
2022-01-11 13:49 ` [PATCH crypto 0/2] smaller blake2s code size on m68k and other small platforms Jason A. Donenfeld
2022-01-11 13:49   ` [PATCH crypto 1/2] lib/crypto: blake2s-generic: reduce code size on small systems Jason A. Donenfeld
2022-01-12 10:57     ` Geert Uytterhoeven [this message]
2022-01-12 13:16       ` Jason A. Donenfeld
2022-01-12 18:31     ` Eric Biggers
2022-01-12 18:50       ` Jason A. Donenfeld
2022-01-12 21:27         ` David Laight
2022-01-12 22:00           ` Jason A. Donenfeld
2022-01-11 13:49   ` [PATCH crypto 2/2] lib/crypto: blake2s: move hmac construction into wireguard Jason A. Donenfeld
2022-01-11 14:43     ` Ard Biesheuvel
2022-01-12 18:35     ` Eric Biggers
2022-01-11 18:10   ` [PATCH crypto v2 0/2] reduce code size from blake2s on m68k and other small platforms Jason A. Donenfeld
2022-01-11 18:10     ` [PATCH crypto v2 1/2] lib/crypto: blake2s: move hmac construction into wireguard Jason A. Donenfeld
2022-01-11 18:10     ` [PATCH crypto v2 2/2] lib/crypto: sha1: re-roll loops to reduce code size Jason A. Donenfeld
2022-01-11 22:05     ` [PATCH crypto v3 0/2] reduce code size from blake2s on m68k and other small platforms Jason A. Donenfeld
2022-01-11 22:05       ` [PATCH crypto v3 1/2] lib/crypto: blake2s: move hmac construction into wireguard Jason A. Donenfeld
2022-01-11 22:05       ` [PATCH crypto v3 2/2] lib/crypto: sha1: re-roll loops to reduce code size Jason A. Donenfeld
2022-01-12 10:59       ` [PATCH crypto v3 0/2] reduce code size from blake2s on m68k and other small platforms Geert Uytterhoeven
2022-01-12 13:18         ` Jason A. Donenfeld
2022-01-18  6:42           ` Herbert Xu
2022-01-18 11:43             ` Jason A. Donenfeld
2022-01-18 12:44               ` David Laight
2022-01-18 12:50                 ` Jason A. Donenfeld

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