Re: 16-bit page checksums for 9.2
Simon Riggs <simon@2ndquadrant.com>
From: Simon Riggs <simon@2ndQuadrant.com>
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-hackers@postgresql.org,
Kevin Grittner <Kevin.Grittner@wicourts.gov>, aidan@highrise.ca, stark@mit.edu
Date: 2012-01-04T10:08:35Z
Lists: pgsql-hackers
On Wed, Jan 4, 2012 at 9:20 AM, Andres Freund <andres@anarazel.de> wrote: > On Tuesday, January 03, 2012 11:21:42 PM Kevin Grittner wrote: >> (1) I like the choice of Fletcher-16. It should be very good at >> detecting problems while being a lot less expensive that an official >> CRC calculation. > I wonder if CRC32c wouldn't be a good alternative given more and more cpus > (its in SSE 4.2) support calculating it in silicon. We're trying to get something that fits in 16bits for this release. I'm guessing CRC32c doesn't? -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services