| From: | "Luke Lonergan" <llonergan(at)greenplum(dot)com> |
|---|---|
| To: | "Brian Hurt" <bhurt(at)janestcapital(dot)com> |
| Cc: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: File Systems Compared |
| Date: | 2006-12-06 17:40:25 |
| Message-ID: | C19C4089.14E0D%llonergan@greenplum.com |
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| Lists: | pgsql-performance |
Brian,
On 12/6/06 8:40 AM, "Brian Hurt" <bhurt(at)janestcapital(dot)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
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