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Date: Wed, 06 Dec 2006 15:24:09 -0500
From: Brian Hurt <bhurt@janestcapital.com>
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To: Luke Lonergan <llonergan@greenplum.com>
CC: pgsql-performance@postgresql.org
Subject: Re: File Systems Compared
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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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Luke Lonergan wrote:<br>
<blockquote cite="midC19C4089.14E0D%25llonergan@greenplum.com"
 type="cite">
  <pre wrap="">Brian,

On 12/6/06 8:40 AM, "Brian Hurt" <a class="moz-txt-link-rfc2396E" href="mailto:bhurt@janestcapital.com">&lt;bhurt@janestcapital.com&gt;</a> wrote:

  </pre>
  <blockquote type="cite">
    <pre wrap="">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.
    </pre>
  </blockquote>
  <pre wrap=""><!---->
See here for the official specifications of both:
  <a class="moz-txt-link-freetext" href="http://www.pcisig.com/specifications/pcix_20/">http://www.pcisig.com/specifications/pcix_20/</a>

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:
<a class="moz-txt-link-freetext" href="http://www.areca.com.tw/products/html/pcie-sata.htm">http://www.areca.com.tw/products/html/pcie-sata.htm</a>), so they can do 2GB/s.

- Luke 




  </pre>
</blockquote>
Thanks.&nbsp; I stand corrected (again).<br>
<br>
Brian<br>
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