Horton

Re: Cost of XLogInsert CRC calculations

Mark Cave-Ayland <m.cave-ayland@webbased.co.uk>

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From: "Mark Cave-Ayland" <m.cave-ayland@webbased.co.uk>
To: "'Manfred Koizar'" <mkoi-pg@aon.at>
Cc: "'Tom Lane'" <tgl@sss.pgh.pa.us>, "'Greg Stark'" <gsstark@mit.edu>, "'Bruce Momjian'" <pgman@candle.pha.pa.us>, <pgsql-hackers@postgresql.org>
Date: 2005-05-27T13:40:49Z
Lists: pgsql-hackers 
 

> -----Original Message-----
> From: Manfred Koizar [mailto:mkoi-pg@aon.at] 
> Sent: 25 May 2005 20:25
> To: Manfred Koizar
> Cc: Tom Lane; Greg Stark; Bruce Momjian; Mark Cave-Ayland 
> (External); pgsql-hackers@postgresql.org
> Subject: Re: [HACKERS] Cost of XLogInsert CRC calculations

(cut)

> The most important figure is, that at MaxSpeed (/O2) 2x32 is 
> almost twice as fast as CRC64 while only being marginally 
> slower than CRC32.
> 
> Servus
>  Manfred