On Tue, Jan 30, 2001 at 10:19:58AM -0700, Jeff V. Merkey wrote:
> On Mon, Jan 29, 2001 at 09:41:21PM -0700, Todd wrote:
>
> Sparc servers. The adapters these drivers I posted support are a bi-CMOS
> implementation of the SCI LC3 chipsets, and even though they are
> bi-CMOS, the Link speed on the back end is still 500 MB/S --
> very respectable.
Sounds impressive (and expensive)
>
> in another system with **NO COPYING**. Ethernet and LAN networking always
> copies data into userspace -- SCI has the ability to dump it directly
> into user space pages without copying. That's what is cool about SCI,
Well, my GigE card does that too. Not with TCP, though :)
(see http://oss.sgi.com/projects/stp)
> processor utilitzation will be high, and there will be lots of
> copying going on in the system. What numbers does G-Enet provide
> doing userspace -> userspace transfers, and at what processor
> overhead? These are the types of things that are the metrics for
What I get is 102MB/s with 4% CPU use on a dual pIII/500 32/66 box sending to
a dual pII/450 32/33 box (about 10M/s less the other way around, so
I'm assuming I'd get somewhat more with real 64/66 PCI buses on both
machines)
> I could ask Dolphin for a GaAs version of the LC3 card (one board would
> cost the equivalent to the income of a small third world nation), and
> rerun the tests on a Sparc system or Sequent system, and watch G-Enet
> system suck wind in comparison.
Or you can buy an Alteon-based Netgear 620 for under $300. It all
depends on your budget and needs :)
--
Pekka Pietikainen
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