| From: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
|---|---|
| To: | Aidan Van Dyk <aidan(at)highrise(dot)ca> |
| Cc: | Simon Riggs <simon(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: How much do the hint bits help? |
| Date: | 2010-12-22 16:00:45 |
| Message-ID: | AANLkTik2nF6=HjMcmCwYrMMB52j1VajS3rzm=6e-C4jf@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, Dec 22, 2010 at 10:55 AM, Aidan Van Dyk <aidan(at)highrise(dot)ca> wrote:
> On Wed, Dec 22, 2010 at 10:52 AM, Simon Riggs <simon(at)2ndquadrant(dot)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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