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 11:40:06 -0500
Message-ID: <4576F266.9040205@janestcapital.com> (raw)
In-Reply-To: <C19C2E17.14DD1%llonergan@greenplum.com>
References: <C19C2E17.14DD1%llonergan@greenplum.com>
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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To: pgsql-performance@postgresql.org
Cc: bhurt@janestcapital.com, llonergan@greenplum.com
Subject: Re: File Systems Compared
In-Reply-To: <4576F266.9040205@janestcapital.com>
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