* Andreas Karlsson (andr...@proxel.se) wrote: > On 01/21/2017 04:48 PM, Stephen Frost wrote: > >* Fujii Masao (masao.fu...@gmail.com) wrote: > >>If the performance overhead by the checksums is really negligible, > >>we may be able to get rid of wal_log_hints parameter, as well. > > > >Prior benchmarks showed it to be on the order of a few percent, as I > >recall, so I'm not sure that we can say it's negligible (and that's not > >why Magnus was proposing changing the default). > > It might be worth looking into using the CRC CPU instruction to > reduce this overhead, like we do for the WAL checksums. Since that > is a different algorithm it would be a compatibility break and we > would need to support the old algorithm for upgraded clusters..
+1. I'd be all for removing the option and requiring checksums if we do that and it turns out that the performance hit ends up being less than 1%. Thanks! Stephen
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