| From: | Zeugswetter Andreas SB <ZeugswetterA(at)wien(dot)spardat(dot)at> |
|---|---|
| To: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | AW: Re: TODO list |
| Date: | 2001-04-05 15:45:46 |
| Message-ID: | 11C1E6749A55D411A9670001FA687963368271@sdexcsrv1.f000.d0188.sd.spardat.at |
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| Lists: | pgsql-hackers |
> > 1. Under "RELIABILITY/MISC", add:
> >
> > Write out a CRC with each data block, and verify it on reading.
> TODO updated. I know we did number 2, but did we agree on #1 and is it
> done?
Has anybody done performance and reliability tests with CRC64 ?
I think it must be a CPU eater. It looks a lot more complex than a CRC32.
Since we need to guard a maximum of 32k bytes for pg pages I would - if at all -
consider to use a 32bit adler instead of a CRC, since that is a lot cheaper
to calculate.
Andreas
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