Thread (5 messages) 5 messages, 3 authors, 2016-07-05

Re: [PATCH 2/2] crypto: powerpc: Add POWER8 optimised crc32c

From: Herbert Xu <herbert@gondor.apana.org.au>
Date: 2016-07-05 15:14:40
Also in: linux-crypto

On Fri, Jul 01, 2016 at 08:19:45AM +1000, Anton Blanchard wrote:
From: Anton Blanchard <redacted>

Use the vector polynomial multiply-sum instructions in POWER8 to
speed up crc32c.

This is just over 41x faster than the slice-by-8 method that it
replaces. Measurements on a 4.1 GHz POWER8 show it sustaining
52 GiB/sec.

A simple btrfs write performance test:

    dd if=/dev/zero of=/mnt/tmpfile bs=1M count=4096
    sync

is over 3.7x faster.

Signed-off-by: Anton Blanchard <redacted>
Both patches applied.  Thanks.
-- 
Email: Herbert Xu [off-list ref]
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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