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 best regards, Florian Pflug -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
