Messages in this thread | | | Date | Tue, 30 Jan 2001 19:22:48 +0200 | From | Pekka Pietikainen <> | Subject | Re: [ANNOUNCE] Dolphin PCI-SCI RPM Drivers 1.1-4 released |
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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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