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Re: [2.4 PATCH] pcnet32.c - tx underflow error

To: Alan Cox <>
Subject: Re: [2.4 PATCH] pcnet32.c - tx underflow error
From: Thomas Bogendoerfer <>
Date: Thu, 11 Jul 2002 10:12:43 +0200
Cc: Jun Sun <>,, Ralf Baechle <>,
In-reply-to: <>
References: <> <>
User-agent: Mutt/1.3.25i
On Thu, Jul 11, 2002 at 03:16:03AM +0100, Alan Cox wrote:
> > I even suspect this is the default setting on PCI cards on PC.  Can someone 
> > verify?  If that is the case, that will explain why driver never sets this 
> > bit.  Maybe we don't have any "real computers" after all. :-)
> Most PC hardware can deliver that kind of DMA guarantee. UDMA100 doesn't
> work very well otherwise.

I've seen this problem on a lot of PC hardware, too. The best fix would
be to enable full packet mode, when the driver sees too much TX underruns.


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