Question: eth0: interrupt(s) dropped! messages 

Forum: PCMCIA Network Adapter Issues
Date: 1999, Nov 01
From: Rick Lerner rlerner

PROBLEM: My network PCCard appears to work fine, but /var/log/messages contains hundreds of lines containing the following error message: Nov 1 15:46:06 localhost kernel: eth0: interrupt(s) dropped! Any ideas what is wrong? I recently updated my laptop from RedHat 5.1 to 6.1. To complete the upgrade I needed to add an ifcfg-eth0 file with the following contents: /etc/sysconfig/network-scripts/ifcfg-eth0: DEVICE=eth0 BOOTPROTO=dhcp ONBOOT=no I also added links to /etc/rc.d/init.d/pcmcia in /etc/rc.d/rc[345].d Otherwise, the pcmcia configuration files are the ones installed by RedHat. Thanks for any information, Rick Lerner (rick@aai.com ) Amerinex Applied Imaging, Inc. -------------------------------------------------- DETAILS: -------------------------------------------------- System Type: Ergo Bigscreen4 laptop Processor: Pentium II, 266MHz RAM: 96MB Linux: RedHat 6.1 uname -rv: 2.2.12-20 #1 Mon Sep 27 10:40:35 EDT 1999 PCMCIA Version: cardctl version 3.0.14 Probe output: PCI bridge probe: O2Micro OZ6836 found, 2 sockets. cardctl status Socket 0: 5V 16-bit card present Function 0: ready Socket 1: no card cardctl ident Socket 0: product info: "3Com Corporation", "3C589", "TP/BNC LAN Card Ver. 2a", "000002" manfid: 0x0101, 0x0589 function: 6 (network) Socket 1: no product info available ---------------------------------------------------------------------- /var/log/messages excerpt generated by /etc/rc.d/init.d/pcmcia start (after a stop whose output is not shown) ---------------------------------------------------------------------- Nov 1 17:50:10 localhost kernel: Linux PCMCIA Card Services 3.0.14 Nov 1 17:50:10 localhost kernel: kernel build: 2.2.12-20 #1 Mon Sep 27 10:40:35 EDT 1999 Nov 1 17:50:10 localhost kernel: options: [pci] [cardbus] [apm] Nov 1 17:50:10 localhost kernel: Intel PCIC probe: Nov 1 17:50:10 localhost kernel: O2Micro OZ6836 PCI-to-CardBus at bus 0 slot 3, mem 0x28000000, 2 sockets Nov 1 17:50:10 localhost kernel: host opts [0]: [a 00] [b 00] [c 00] [d 83] [mhpg 18] [fifo 08] [e 0a] [no pci irq] [lat 168/176] [bus 32/34] Nov 1 17:50:10 localhost kernel: host opts [1]: [a 00] [b 00] [c 50] [d 83] [mhpg 18] [fifo 08] [e 0a] [no pci irq] [lat 168/176] [bus 35/37] Nov 1 17:50:10 localhost kernel: ISA irqs (scanned) = 10 polling interval = 1000 ms Nov 1 17:50:10 localhost cardmgr[1507]: starting, version is 3.0.14 Nov 1 17:50:10 localhost cardmgr[1507]: watching 2 sockets Nov 1 17:50:10 localhost kernel: cs: IO port probe 0x1000-0x17ff: excluding 0x1000-0x104f Nov 1 17:50:10 localhost kernel: cs: IO port probe 0x0100-0x04ff: excluding 0x100-0x107 0x200-0x207 0x220-0x22f 0x300-0x307 0x378-0x37f 0x388-0x38f 0x4d0-0x4d7 Nov 1 17:50:10 localhost kernel: cs: IO port probe 0x0a00-0x0aff: clean. Nov 1 17:50:11 localhost cardmgr[1507]: initializing socket 0 Nov 1 17:50:11 localhost kernel: cs: memory probe 0xa0000000-0xa0ffffff: excluding 0xa0000000-0xa00fffff Nov 1 17:50:11 localhost cardmgr[1507]: socket 0: 3Com 3c589 Ethernet Nov 1 17:50:11 localhost cardmgr[1507]: executing: 'insmod /lib/modules/2.2.12-20/pcmcia/3c589_cs.o' Nov 1 17:50:11 localhost kernel: eth0: 3Com 3c589, io 0x310, irq 10, hw_addr 00:20:AF:DF:F6:1B Nov 1 17:50:11 localhost kernel: 8K FIFO split 5:3 Rx:Tx, auto xcvr Nov 1 17:50:11 localhost cardmgr[1507]: executing: './network start eth0' Nov 1 17:50:12 localhost pumpd[1537]: starting at Mon Nov 1 17:50:12 1999 Nov 1 17:50:13 localhost kernel: eth0: interrupt(s) dropped! Nov 1 17:50:17 localhost pumpd[1537]: configured interface eth0 Nov 1 17:50:17 localhost cardmgr[1507]: + Determining IP information for eth0... done. Nov 1 17:50:18 localhost kernel: eth0: flipped to 10baseT Nov 1 17:50:24 localhost kernel: eth0: interrupt(s) dropped! Nov 1 17:50:56 localhost last message repeated 4 times Nov 1 17:52:03 localhost last message repeated 9 times Nov 1 17:53:04 localhost last message repeated 10 times

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Re: Question: eth0: interrupt(s) dropped! messages Re: Question: eth0: interrupt(s) dropped! messages (Rick Lerner) Date: 1999, Nov 01 From: David Hinds <dhinds@pcmcia.sourceforge.org>

On Mon, Nov 01, 1999 at 03:08:48PM -0800, Rick Lerner wrote: > > Nov 1 15:46:06 localhost kernel: eth0: interrupt(s) dropped! "interrupt(s) dropped" means that the card indicates it tried to generate an interrupt, but the host didn't actually see it. There are a couple possible causes for this. One is that another system device could be occupying this interrupt line, electrically interfering with the PCMCIA card's attempt to trigger an interrupt. Another possibility is a problem with interrupt setup in the PCMCIA bridge. In the first case, you could exclude the interrupt line used by the PCMCIA device in your /etc/pcmcia/config.opts file, to force the card to get a different interrupt. The second case is more tricky because it indicates a problem in the Linux socket driver. In your case, I think it is a problem of the second type. The O2Micro CardBus bridges have some known problems with the current Linux driver package. Interrupt routing is handled differently from other bridges, and the datasheets are confusing. One thing to try: in /etc/sysconfig/pcmcia, set: PCIC_OPTS="do_scan=0" which will disable the i82365 module's interrupt scanning code. The driver seems to think that irq 10 is the only one available for PCMCIA, and that seems likely to be wrong. It is possible that another interrupt line will behave better. If this doesn't improve things, I'd count your blessings, since you've picked a card with a driver that (relatively) painlessly recovers from missed interrupts. You won't get great performance, but it is better than a card that doesn't work at all. -- Dave

1. Ok: do_scan did the trick by Rick Lerner, 1999, Nov 02

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