Re: How much do the hint bits help? - Mailing list pgsql-hackers

From Merlin Moncure
Subject Re: How much do the hint bits help?
Date
Msg-id AANLkTik2nF6=HjMcmCwYrMMB52j1VajS3rzm=6e-C4jf@mail.gmail.com
Whole thread Raw
In response to Re: How much do the hint bits help?  (Aidan Van Dyk <aidan@highrise.ca>)
Responses Re: How much do the hint bits help?  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers
On Wed, Dec 22, 2010 at 10:55 AM, Aidan Van Dyk <aidan@highrise.ca> wrote:
> On Wed, Dec 22, 2010 at 10:52 AM, Simon Riggs <simon@2ndquadrant.com> wrote:
>
>> I'm sure it will take a little while for everybody to understand why a
>> full CRC implementation is both necessary and now possible. Paradigm
>> shifts of thought do seem like teleports, but they can be beneficial.
>
> But please don't deny the rest of us airbags while you keep working on
> teleportation ;-)

well, simon's point that hint bits complicate checksum may nor may not
be the case, but no hint bits = less i/o = less checksumming (unless
you checksum around the hint bits).  This lowers the expense of doing
it, which is nice.  Maybe that doesn't matter in the end, we'll see.

merlin


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