From owner-freebsd-questions  Wed Apr 21 14:43:18 1999
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Date: Wed, 21 Apr 1999 14:40:00 -0700 (PDT)
From: Doug White <dwhite@resnet.uoregon.edu>
To: Khetan Gajjar <khetan@os.org.za>
Cc: questions@FreeBSD.ORG
Subject: Re: de0: abnormal interrupt: transmit underflow
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On Wed, 21 Apr 1999, Khetan Gajjar wrote:

> Hi.
> 
> I'm running 4-current (updated yesterday), but I've had this problem for
> a while (well over a year).
> 
> I get these errors
> Apr 21 20:55:00 chain /kernel: de0: abnormal interrupt: transmit underflow
> whenever I try to transfer things to or from my network.
> The card is a SMC, and is probed as
> de0: <Digital 21041 Ethernet> at device 11.0 on pci0
> de0: interrupting at irq 5
> de0: SMC 21041 [10Mb/s] pass 1.1
> de0: address 00:00:c0:f9:2f:c8
> 
> I have tried shifting the card to another PCI bus, I've tried
> ifconfig de0 down, ifconfig de0 up, but this doesn't solve the
> problem. I've pretty much tried all the suggestions that other
> people have suggested, except for (obviously) replacing the card.
> I don't think the card is dead, because it works perfectly for small
> files.

Is something (like an internal soundcard) sitting on IRQ 5?  Try
overriding it from the BIOS.

> Does anyone have any suggestions ? The problems occur whenever
> I transfer anything other than small files (ie greater than 100k)
> either to or from the client PC's to the FreeBSD machine.
> 
> The collision light on the hub also goes on. Could it be the ether
> cable from the PC to the hub ? It's about 10-15m in length,
> so I haven't replaced it because that would entail ordering another
> length, which I haven't had time to do.
> 
> netstat -i reveals
> Name  Mtu   Network       Address            Ipkts Ierrs    Opkts Oerrs  Coll
> de0   1500  <Link>      00.00.c0.f9.2f.c8    23420     0    21720   805   826
> de0   1500  freebsd-net/2 fence              23420     0    21720   805   826

This is bad.  Check your cabling.  What brand/model of hub?

Doug White                               
Internet:  dwhite@resnet.uoregon.edu    | FreeBSD: The Power to Serve
http://gladstone.uoregon.edu/~dwhite    | www.freebsd.org



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