| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Simon Riggs" <simon(at)2ndquadrant(dot)com> |
| Cc: | "Bruce Momjian" <bruce(at)momjian(dot)us>, "Jim Nasby" <decibel(at)decibel(dot)org>, "Zeugswetter Andreas ADI SD" <ZeugswetterA(at)spardat(dot)at>, pgsql-hackers(at)postgresql(dot)org, pgsql-patches(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] [PATCHES] wal_checksum = on (default) | off |
| Date: | 2007-01-11 14:01:09 |
| Message-ID: | 17133.1168524069@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-patches |
"Simon Riggs" <simon(at)2ndquadrant(dot)com> writes:
> COPY XLogInsert() #1 on oprofile results at 17% CPU
> (full_page_writes = on)
But what portion of that is actually CRC-related? XLogInsert does quite
a lot.
Anyway, I can't see degrading the reliability of the system for a gain
in the range of a few percent, which is the most that we'd be likely
to get here ... for a factor of two or more, maybe people would be
willing to take a risk.
regards, tom lane
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