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Date:      Thu, 3 Feb 2000 12:29:53 -0700
From:      "Kenneth D. Merry" <ken@kdm.org>
To:        Matthew Jacob <mjacob@feral.com>
Cc:        Thomas Stromberg <tstromberg@rtci.com>, freebsd-hackers@FreeBSD.ORG
Subject:   Re: Suggestions for Gigabit cards for -CURRENT
Message-ID:  <20000203122953.A53875@panzer.kdm.org>
In-Reply-To: <Pine.BSF.4.05.10002031122280.64395-100000@semuta.feral.com>; from mjacob@feral.com on Thu, Feb 03, 2000 at 11:23:45AM -0800
References:  <20000203122114.A53673@panzer.kdm.org> <Pine.BSF.4.05.10002031122280.64395-100000@semuta.feral.com>

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On Thu, Feb 03, 2000 at 11:23:45 -0800, Matthew Jacob wrote:
> > 
> > I think the memory would come in handy on a heavily loaded system, since
> > you would gain a little extra time in case you were a little late servicing
> > interrupts.  i.e. it would smooth out the bumps a little bit.
> 
> Yes, but that's what having 8192 2KByte descriptors handy is for... (that's
> 16MB of buffering).

Are those all in card memory, or in host memory?  What happens when you've
got some other traffic on the PCI bus, and the card gets a little behind
in DMAing its data into host memory?

> > If your PCI implementation won't keep up with gigabit speeds, you'll just
> > go slower. :)  Most newer systems (e.g. 440BX) shouldn't have any trouble
> > doing a reasonable amount of speed over gigabit ethernet, though.
> 
> Typically I don't see higher than 60 or 70MB/s real throughput on most
> systems.

I've seen 100MB/sec on Pentium II 450's (440BX), and 90MB/sec on Pentium II
350's (440BX).

Ken
-- 
Kenneth Merry
ken@kdm.org


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