Re: [REVIEW] Re: Compression of full-page-writes - Mailing list pgsql-hackers

From Florian Weimer
Subject Re: [REVIEW] Re: Compression of full-page-writes
Date
Msg-id 87ioketg0i.fsf@mid.deneb.enyo.de
Whole thread Raw
In response to Re: [REVIEW] Re: Compression of full-page-writes  (Ants Aasma <ants@cybertec.at>)
Responses Re: [REVIEW] Re: Compression of full-page-writes  (Ants Aasma <ants@cybertec.at>)
List pgsql-hackers
* Ants Aasma:

> CRC has exactly one hardware implementation in general purpose CPU's

I'm pretty sure that's not true.  Many general purpose CPUs have CRC
circuity, and there must be some which also expose them as
instructions.

> and Intel has a patent on the techniques they used to implement
> it. The fact that AMD hasn't yet implemented this instruction shows
> that this patent is non-trivial to work around.

I think you're jumping to conclusions.  Intel and AMD have various
cross-licensing deals.  AMD faces other constraints which can make
implementing the instruction difficult.



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