Why shared_buffers max is 8GB?

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To: pgsql-performance@xxxxxxxxxxxxxx
Subject: Why shared_buffers max is 8GB?
From: Alexey Vasiliev <leopard_ne@xxxxxxxx>
Date: Wed, 26 Mar 2014 16:21:51 +0400
Reply-to: Alexey Vasiliev <leopard_ne@xxxxxxxx>

I read from several sources, what maximum shared_buffers is 8GB.

Does this true? If yes, why exactly this number is maximum number of shared_buffers for good performance (on Linux 64-bits)?

Thanks!

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