Florian Pflug wrote:
On Jun 7, 2010, at 12:45 , Andres Freund wrote:
On Monday 07 June 2010 12:37:13 Pierre C wrote:
On Sunday 30 May 2010 18:29:31 Greg Stark wrote:
On Sun, May 30, 2010 at 4:54 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:
I read through that thread and couldn't find much discussion of
alternative CRC implementations --- we spent all our time on arguing
about whether we needed 64-bit CRC or not.
SSE4.2 has a hardware CRC32 instruction, this might be interesting to
use...
Different polynom unfortunately...
Since only the WAL uses CRC, I guess the polynomial could be changed though.
pg_upgrade for example shouldn't care.
RFC3385 compares different checksumming methods for use in iSCSI, and CRC32c (which uses the same polynomial as the SSE4.2 instruction) wins. Here's
a link: http://www.faqs.org/rfcs/rfc3385.html
The linux kernel also uses it when it's availabe, see e.g.
http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/arch/x86/crypto/crc32c-intel.c
regards,
Yeb Havinga
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