Re: 3com 3c509c-tpo problem ...
From: Alexander Harsch (infodude_at_gmx.de)
Date: 04/28/05
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Date: Thu, 28 Apr 2005 22:04:39 +0200
> It sounds like if you want full duplex mode, it's known well enough to be
> documented that you card is a 'bad player', and should be expected to
> perform poorly if set to automatically negotiate this mode with another
> node on the network, such as a autonegotiating switch, or another NI card.
> Probably due to the design that precedes the applicable standard +/or poor
> firmware or controller chipz. 3com has always considered itself a
> 'standard setter', and 'innovative'. Probably their cards of the same
> revision work well enough with each other....
>
>
> HTH,
>
> /..
>
Hello,
I had the same problem in my lab with the 3Com 3c905b. And I also replaced
them with Realtek chipset based cards. This works BETTER. The thing is that
if I put the line on high load in one direction, 100 percent of the packets
are received. If I do the same load in both dircections to the same time,
only about 85 percent of the packets are delivered. In theory on a full
duplex line, this should not be the case. I set the cards to:
speed 10 Mbit, duplex full, autonegation off (on both sides)
I used ethtool and mii-tool with the same results. I tried different Kernel
versions as well (2.6.7, 2.6.8, 2.6.10). So, whats really going on with
full duplex? I need 100 percent accuracy for my experiments. Do you have
any hint for me?
Thanks in advance, Alex
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