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Date: Wed, 06 Dec 2006 11:40:06 -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
References: <C19C2E17.14DD1%llonergan@greenplum.com>
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Luke Lonergan wrote:

>Brian,
>
>On 12/6/06 8:02 AM, "Brian Hurt" <bhurt@janestcapital.com> wrote:
>
>  
>
>>These numbers are close enough to bus-saturation rates
>>    
>>
>
>PCIX is 1GB/s + and the memory architecture is 20GB/s+, though each CPU is
>likely to obtain only 2-3GB/s.
>
>We routinely achieve 1GB/s I/O rate on two 3Ware adapters and 2GB/s on the
>Sun X4500 with ZFS.
>
>  
>
For some reason I'd got it stuck in my head that PCI-Express maxed out 
at a theoretical 533 MByte/sec- at which point, getting 480 MByte/sec 
across it is pretty dang good.  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.

Brian


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Luke Lonergan wrote:<br>
<blockquote cite="midC19C2E17.14DD1%25llonergan@greenplum.com"
 type="cite">
  <pre wrap="">Brian,

On 12/6/06 8:02 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="">These numbers are close enough to bus-saturation rates
    </pre>
  </blockquote>
  <pre wrap=""><!---->
PCIX is 1GB/s + and the memory architecture is 20GB/s+, though each CPU is
likely to obtain only 2-3GB/s.

We routinely achieve 1GB/s I/O rate on two 3Ware adapters and 2GB/s on the
Sun X4500 with ZFS.

  </pre>
</blockquote>
For some reason I'd got it stuck in my head that PCI-Express maxed out
at a theoretical 533 MByte/sec- at which point, getting 480 MByte/sec
across it is pretty dang good.&nbsp; But actually looking things up, I see
that PCI-Express has a theoretical 8 Gbit/sec, or about 800Mbyte/sec.&nbsp;
It's PCI-X that's 533 MByte/sec.&nbsp; So there's still some headroom
available there.<br>
<br>
Brian<br>
<br>
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