| From: | Brian Hurt <bhurt(at)janestcapital(dot)com> |
|---|---|
| To: | Luke Lonergan <llonergan(at)greenplum(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: File Systems Compared |
| Date: | 2006-12-06 16:40:06 |
| Message-ID: | 4576F266.9040205@janestcapital.com |
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| Thread: | |
| Lists: | pgsql-performance |
Luke Lonergan wrote:
>Brian,
>
>On 12/6/06 8:02 AM, "Brian Hurt" <bhurt(at)janestcapital(dot)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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