From: Brian Hurt <bhurt@janestcapital.com>
To: Luke Lonergan <llonergan@greenplum.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: File Systems Compared
Date: Wed, 06 Dec 2006 15:24:09 -0500
Message-ID: <457726E9.50607@janestcapital.com> (raw)
In-Reply-To: <C19C4089.14E0D%llonergan@greenplum.com>
References: <C19C4089.14E0D%llonergan@greenplum.com>
Luke Lonergan wrote:
>Brian,
>
>On 12/6/06 8:40 AM, "Brian Hurt" <bhurt@janestcapital.com> wrote:
>
>
>
>>But actually looking things up, I see that PCI-Express has a theoretical 8
>>Gbit/sec, or about 800Mbyte/sec. It's PCI-X that's 533 MByte/sec. So there's
>>still some headroom available there.
>>
>>
>
>See here for the official specifications of both:
> http://www.pcisig.com/specifications/pcix_20/
>
>Note that PCI-X version 1.0 at 133MHz runs at 1GB/s. It's a parallel bus,
>64 bits wide (8 bytes) and runs at 133MHz, so 8 x 133 ~= 1 gigabyte/second.
>
>PCI Express with 16 lanes (PCIe x16) can transfer data at 4GB/s. The Arecas
>use (PCIe x8, see here:
>http://www.areca.com.tw/products/html/pcie-sata.htm), so they can do 2GB/s.
>
>- Luke
>
>
>
>
>
>
Thanks. I stand corrected (again).
Brian
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To: pgsql-performance@postgresql.org
Cc: bhurt@janestcapital.com, llonergan@greenplum.com
Subject: Re: File Systems Compared
In-Reply-To: <457726E9.50607@janestcapital.com>
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