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Message-ID: <3DF28151.40706@pobox.com>
Date: Sat, 07 Dec 2002 18:16:33 -0500
From: Jeff Garzik <jgarzik@pobox.com>
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To: Andrew Morton <akpm@digeo.com>
CC: Matt Rickard <mjr318@psu.edu>, linux-kernel@vger.kernel.org
Subject: Re: Oops with 3c59x module (3com 3c595 NIC)
References: <20021207164300.2a35f18d.mjr318@psu.edu> <3DF2738A.2447599@digeo.com>
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Andrew Morton wrote:
> That's a transmit underrun - data is not being fed into the NIC
> across the PCI bus fast enough.  Possibly something has gone
> wrong with the busmastering logic on the mainboard, or the NIC.
> 
> The driver will reset the transmitter when this happens, as per the
> manual.  There's not much else we can do.


pci-skeleton.c and several of Don's drivers actually do do something 
else on TxUnderrun, twiddle DMA burst settings:

         if ((intr_status & TxUnderrun)
                 && (np->tx_config & TxThresholdField) != 
TxThresholdField) {
                 long ioaddr = dev->base_addr;
                 np->tx_config += TxThresholdInc;
                 writel(np->tx_config, ioaddr + TxMode);
                 np->stats.tx_fifo_errors++;
         }

I wonder how feasible it is to do that on 3c59x hardware?

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