From: Alex Elsayed <eternaleye@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: Re: [RFC PATCH] Btrfs: add sha256 checksum option
Date: Mon, 01 Dec 2014 15:46:33 -0800 [thread overview]
Message-ID: <m5iukq$s45$2@ger.gmane.org> (raw)
In-Reply-To: CAJBj3vfnvtcb8NTQ2k4eg43oEtOx9YT4SFZ6wfOjC=fvSrHmow@mail.gmail.com
John Williams wrote:
> On Mon, Dec 1, 2014 at 3:05 PM, Alex Elsayed <eternaleye@gmail.com> wrote:
>> Incidentally, you can be 'skeptical' all you like - per Austin's message
>> upthread, he was testing the Crypto API. Thus, skeptical as you may be,
>> hard evidence shows that SHA-1 was equal to or faster than CRC32, which
>> is unequivocally simpler and faster than CityHash (though CityHash comes
>> close).
>>
>> And the CPUs in question are *not* particularly rare - Intel since Sandy
>> Bridge or so, the majority of SPARC systems, a goodly number of ARM
>> systems via coprocessors...
>
> You can make convoluted, incorrect claims all you like, but the fact
> is that SHA-1 is not as fast as Spooky2 or CityHash128 on x64 Intel
> CPUs, and Murmur3 is faster on ARM systems. And it is not even close.
> Your claims are absurd.
And that _is_ the case; they are faster... *when both are software
implementations*
And I'm not sure what is "convoluted" or "incorrect" about saying "Look,
empirical evidence!"
next prev parent reply other threads:[~2014-12-01 23:50 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-24 5:23 [RFC PATCH] Btrfs: add sha256 checksum option Liu Bo
2014-11-24 5:23 ` [RFC PATCH] Btrfs-progs: support sha256 checksum algorithm Liu Bo
2014-11-24 8:23 ` [RFC PATCH] Btrfs: add sha256 checksum option Holger Hoffstätte
2014-11-24 18:55 ` Duncan
2014-11-24 19:34 ` John Williams
2014-11-25 10:30 ` Liu Bo
2014-11-25 10:52 ` Daniel Cegiełka
2014-11-25 23:17 ` John Williams
2014-11-26 12:50 ` Holger Hoffstätte
2014-11-26 17:53 ` John Williams
2014-11-25 10:28 ` Liu Bo
2014-11-24 20:07 ` Chris Mason
2014-11-24 20:58 ` Hugo Mills
2014-11-25 3:04 ` Qu Wenruo
2014-11-25 5:13 ` Zygo Blaxell
2014-11-25 11:30 ` Liu Bo
2014-11-26 13:36 ` Brendan Hide
2014-11-25 16:47 ` David Sterba
2014-11-25 19:45 ` Bardur Arantsson
2014-11-26 13:38 ` Brendan Hide
2014-11-26 13:58 ` Austin S Hemmelgarn
2014-12-01 18:37 ` David Sterba
2014-12-01 20:35 ` Austin S Hemmelgarn
2014-12-01 20:51 ` John Williams
2014-12-01 23:23 ` Alex Elsayed
2014-12-15 18:47 ` David Sterba
2014-11-25 16:39 ` David Sterba
2014-11-27 3:52 ` Liu Bo
2014-12-01 18:51 ` David Sterba
2014-11-29 20:38 ` Alex Elsayed
2014-11-29 21:00 ` John Williams
2014-11-29 21:07 ` Alex Elsayed
2014-11-29 21:21 ` John Williams
2014-11-29 21:27 ` Alex Elsayed
2014-12-01 12:39 ` Austin S Hemmelgarn
2014-12-01 17:22 ` John Williams
2014-12-01 17:42 ` Austin S Hemmelgarn
2014-12-01 17:49 ` John Williams
2014-12-01 19:28 ` Alex Elsayed
2014-12-01 19:34 ` Alex Elsayed
2014-12-01 20:26 ` Austin S Hemmelgarn
2014-12-01 19:58 ` John Williams
2014-12-01 20:04 ` Alex Elsayed
2014-12-01 20:08 ` Alex Elsayed
2014-12-01 20:46 ` John Williams
2014-12-01 22:56 ` Alex Elsayed
2014-12-01 23:05 ` Alex Elsayed
2014-12-01 23:37 ` John Williams
2014-12-01 23:46 ` Alex Elsayed [this message]
2014-12-02 0:03 ` John Williams
2014-12-02 0:15 ` Alex Elsayed
2014-12-02 0:30 ` John Williams
2014-12-02 0:34 ` Alex Elsayed
2014-12-02 0:11 ` John Williams
2014-12-01 23:48 ` John Williams
2014-12-02 0:06 ` Alex Elsayed
2014-12-02 0:10 ` Alex Elsayed
2014-12-02 0:16 ` John Williams
2014-12-02 0:28 ` Christoph Anton Mitterer
2014-12-02 0:43 ` Alex Elsayed
2014-12-02 0:53 ` Christoph Anton Mitterer
2014-12-02 1:25 ` Alex Elsayed
2014-12-02 1:32 ` Alex Elsayed
2014-11-30 22:51 ` Christoph Anton Mitterer
2014-11-30 22:59 ` Christoph Anton Mitterer
2014-11-30 23:05 ` Dimitri John Ledkov
2014-12-01 2:55 ` Christoph Anton Mitterer
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