3c574_cs driver interrupt dropped errors?

From: Aaron Baer (judah@opusnet.com)
Date: Tue Apr 02 2002 - 16:13:17 EST

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Google sure isn't turning up much detailed information about this so I
thought I'd see if anyone else here has seen this error before.

(I've seen this with 2.4.17 and 2.4.18 currently running 2.4.18+preempt)

I'm getting a lot of this in /var/log/messages

Mar 26 11:37:52 laptop kernel: eth0: interrupt(s) dropped!
Mar 26 11:49:14 laptop kernel: eth0: interrupt(s) dropped!
Mar 26 11:52:47 laptop kernel: eth0: interrupt(s) dropped!
Mar 26 11:55:22 laptop kernel: eth0: interrupt(s) dropped!

it's a 3Com 572/574 Fast Ethernet card using the 3c574_cs.o driver

the man page says this, which makes sense:

eth#: interrupt(s) dropped!
Indicates that the driver did not receive an interrupt notification for
some reason. The driver will poll the card (with a significant
performance penalty) if the problem persists. The most likely cause is
an interrupt conflict and/or host bridge configuration problem.

because the source code says this,
(/usr/src/linux/drivers/net/pcmcia/3c574_cs.c)

<snip>
    /* Check for pending interrupt with expired latency timer: with
       this, we can limp along even if the interrupt is blocked */
    if ((inw(ioaddr + EL3_STATUS) & IntLatch) &&
                (inb(ioaddr + Timer) == 0xff)) {
                if (!lp->fast_poll)
                        printk(KERN_INFO "%s: interrupt(s) dropped!\n",
dev->name);
                el3_interrupt(dev->irq, lp, NULL);
                lp->fast_poll = HZ;
    }
</snip>

And I've tried multiple interrupts by manipulating
/etc/pcmcia/config.opts

Making sure that the irq's used do not conflict with anything in
/proc/interrupts

Yet I still see this problem. Anyone have any idea what might be going
on here?

Thanks,
A-

-- 
----
Aaron Baer
judah@opusnet.com
http://www.cat.pdx.edu/~baera/
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Next message: Andrew Morton: "[patch] fix ext3 i_blocks accounting"
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