Re: ne2k-pci uncorrectly detecting collisions ?

[Denis Vlasenko]

On Wednesday 05 May 2004 16:10, Lucas Nussbaum wrote:
> On Wed, May 05, 2004 at 09:00:50AM -0400, "Richard B. Johnson" <root@xxxxxxxxxxxxxxxxxx> wrote:
> > > I have experienced problem with the ne2k-pci driver. The symptoms were
> > > extremly poor performance with TCP. After some investigations, I
> > > believe it might be caused by problems with detecting collisions.
> >
> > But software doesn't detect collisions. It just records what
> > hardware said it did. It looks like you have a 10 Mb/s card
> > on a 100 Mb/s network. The collisions reported are how the
> > hardware throttles the difference in physical-link speed.
>
> The hub is a 10/100 one, and the 3 RTL8029 are 10 Mbps only.
>
> > It is possible that software didn't initialize a 100 Mb/s
> > device and instead initialized it to 10 Mb/s, but you
> > don't have any evidence of that presented.
>
> No, because RTL8029 are 10 mbps only (they are BNC/RJ45 NICs).
>
> But what I thought was that maybe, they were initialised as full duplex,
> not half duplex. But again, I don't know where I can check that. I added
> some printks and determined that the code used to init them full duplex
> was never used. And there's no way to force them half duplex with this
> driver.

There is a DOS utility which configure duplex settings for RTL8029.

Also check /proc/interrupts and /proc/ioports for IRQ/ioport collisions.
--
vda

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