From: "George Spelvin" <linux@horizon.com>
To: joakim.tjernlund@transmode.se, linux@horizon.com,
rpearson@systemfabricworks.com
Cc: akpm@linux-foundation.org, fzago@systemfabricworks.com,
linux-kernel@vger.kernel.org
Subject: RE: [PATCH] add slice by 8 algorithm to crc32.c
Date: 8 Aug 2011 16:45:24 -0400 [thread overview]
Message-ID: <20110808204524.12911.qmail@science.horizon.com> (raw)
In-Reply-To: <002b01cc55ec$db14fb90$913ef2b0$@systemfabricworks.com>
> Happy to consider this. I have been asking the list for comments about the
> idea of dropping the BITS=2 and BITS=4 algorithms altogether which would
> make the table size just 256. So far no one has claimed that they actually
> care about those algorithms except as 'examples'. The 'Sarwate' algorithm
> (which I added as an 8 bit version) is faster and only adds 2x4KB of table.
Um, I thought the Sarwate agorithm was what was already there as BITS=8.
(The original paper stores the CRC in two 8-bit variables and two
8-bit tables rather than using 16-bit words, but other than that,
it's identical.)
And that requires just 1KB of table per endianness.
Anyway, I thought the complaint about laarge tables was
not so much the memory as the L1 cache pollution.
next prev parent reply other threads:[~2011-08-08 20:45 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-08 9:28 George Spelvin
2011-08-08 10:31 ` Joakim Tjernlund
2011-08-08 10:52 ` George Spelvin
2011-08-08 11:11 ` Joakim Tjernlund
2011-08-08 17:04 ` Bob Pearson
[not found] ` <OFEA1BD2B2.B2A7F07F-ONC12578E6.003D368C-C12578E6.003D7468@LocalDomain>
2011-08-08 11:24 ` Joakim Tjernlund
2011-08-08 11:42 ` Joakim Tjernlund
2011-08-08 12:54 ` George Spelvin
2011-08-08 17:01 ` Bob Pearson
2011-08-08 20:45 ` George Spelvin [this message]
2011-08-08 22:21 ` Bob Pearson
2011-08-08 16:54 ` Bob Pearson
2011-08-08 16:50 ` Bob Pearson
[not found] <OF4AE0115F.3AA5397E-ONC12578DF.002EC6DF-C12578DF.003348E5@transmode.se>
2011-08-02 21:14 ` Bob Pearson
2011-08-02 21:19 ` Bob Pearson
2011-08-04 11:54 ` Joakim Tjernlund
2011-08-04 18:53 ` Bob Pearson
2011-08-05 9:22 ` Joakim Tjernlund
2011-08-05 15:51 ` Bob Pearson
2011-08-08 7:11 ` Joakim Tjernlund
2011-08-05 17:27 ` Bob Pearson
2011-08-08 7:15 ` Joakim Tjernlund
[not found] ` <OF14136E0E.3F2388EF-ONC12578E3.00301969-C12578E3.00338524@LocalDomain>
2011-08-05 13:34 ` Joakim Tjernlund
-- strict thread matches above, loose matches on Subject: below --
2011-07-20 22:19 frank zago
2011-07-28 22:16 ` Andrew Morton
2011-07-29 1:47 ` Bob Pearson
2011-08-01 19:39 ` Andrew Morton
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