linux-kernel - RE: [patch v3 6/7] crc32: add-slicing-by-8.diff

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Message-ID: <018501cc56d6$448293a0$cd87bae0$@systemfabricworks.com>
Date:	Tue, 9 Aug 2011 15:52:34 -0500
From:	"Bob Pearson" <rpearson@...temfabricworks.com>
To:	"'Joakim Tjernlund'" <joakim.tjernlund@...nsmode.se>
Cc:	<akpm@...ux-foundation.org>, <fzago@...temfabricworks.com>,
	<linux@...izon.com>, <linux-kernel@...r.kernel.org>
Subject: RE: [patch v3 6/7] crc32: add-slicing-by-8.diff

> >    - extend largest BITS size from 32 to 64
> >    - extend table from tab[4][256] to tab[8][256]
> >    - change algorithm to align on 8 byte boundary
> >      (it was noted that all that is really required
> >      is that the inner loop must comsume 8 bytes.
> >      As written it can start on even or odd 4 byte
> >      boundary.)
> So why not do that in the code too?
> 

I did the experiment with the random test set and it is a couple of % faster
so I made the change. I had thought that it wouldn't make a measurable
difference.

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