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Re: What's the best hardver for PostgreSQL 8.1?

From: William Yu <wyu(at)talisys(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: What's the best hardver for PostgreSQL 8.1?
Date: 2005-12-21 23:57:56
Message-ID: docq5v$24ea$1@news.hub.org (view raw or flat)
Thread:
Lists: pgsql-performance
Juan Casero wrote:
> Can you elaborate on the reasons the opteron is better than the Xeon when it 
> comes to disk io?   I have a PostgreSQL 7.4.8 box running a DSS.   One of our 

Opterons have 64-bit IOMMU -- Xeons don't. That means in 64-bit mode, 
transfers to > 4GB, the OS must allocated the memory < 4GB, DMA to that 
block and then the CPU must do extra work in copying the memory to > 
4GB. Versus on the Opteron, it's done by the IO adaptor using DMA in the 
background.

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