From: "Bob Pearson" <rpearson@systemfabricworks.com>
To: "'Joakim Tjernlund'" <joakim.tjernlund@transmode.se>
Cc: <akpm@linux-foundation.org>, <fzago@systemfabricworks.com>,
<linux@horizon.com>, <linux-kernel@vger.kernel.org>
Subject: RE: [patch v3 6/7] crc32: add-slicing-by-8.diff
Date: Tue, 9 Aug 2011 15:52:34 -0500 [thread overview]
Message-ID: <018501cc56d6$448293a0$cd87bae0$@systemfabricworks.com> (raw)
In-Reply-To: <OFBF50514E.82734B36-ONC12578E7.005E58EE-C12578E7.005F648F@transmode.se>
> > - 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.
next prev parent reply other threads:[~2011-08-09 20:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-09 5:27 [patch v3 6/7] crc32: add-slicing-by-8.diff Bob Pearson
2011-08-09 11:21 ` George Spelvin
2011-08-09 15:28 ` Bob Pearson
2011-08-09 17:21 ` Joakim Tjernlund
2011-08-09 20:52 ` Bob Pearson [this message]
2011-08-10 9:32 ` Joakim Tjernlund
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