Date: Fri, 5 Apr 1996 06:37:31 +0200 (MET DST) From: root@deadline.snafu.de (Andreas S. Wetzel) To: bde@zeta.org.au (Bruce Evans) Cc: nate@sri.MT.net, rgrimes@GndRsh.aac.dev.com, current@FreeBSD.org, jgreco@brasil.moneng.mei.com Subject: Re: tty-level buffer overflows - what to do? Message-ID: <m0u53H9-0009QNC@deadline.snafu.de> In-Reply-To: <199604050346.NAA15285@godzilla.zeta.org.au> from Bruce Evans at "Apr 5, 96 01:46:05 pm"
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Hi!
---
Bruce Evans writes:
] The cause has to be a signal on one of the IRQ lines enabled by FreeBSD
] (because masked lines are completely ignored). The signal can then interfere
] with the signal from the enabled board.
But what card could generate such IRQ? The problem seems to occur _only_
during boot at about the time when fsck gets run and a second time a bit
later when some of the daemons get started.
A vmstat -i says:
interrupt total rate
clk0 irq0 2039463 100
rtc0 irq8 2610423 127
wdc0 irq14 17877 0
fdc0 irq6 1 0
sc0 irq1 1 0
sio0 irq4 1657 0
sio1 irq3 283893 13
sio2 irq9 1539814 75
sio3 irq5 25268 1
ed0 irq12 171733 8
stray irq7 5032 0
Total 6695162 328
The rate for irq7 is 0, so I think it hasn't recently occured anymore since
bootup.
The problem happened with all kernels I used on the machine til now. That
included the original 2.2-SNAPSHOT installation kernel, the 2.1.0 RELEASE
installation kernel as well as several kernels I built specifically for
this machine from actual -current sources.
What _really_ made me wonder was that when I used another IDE/FD controller
the problem was gone. But the controller card I use on this machine
a) has no physical connection to the irq 7 line and b) has been in use
for a long time on another machine running -current and did never cause
any problem like that. And apart from that the only irq's that this card
should ever generate should be irq 14 and irq 6 (It's a pure controller
card, no I/O interfaces are on that board).
Well... any ideas how to get rid of that stray irq?
Regards, mickey
--
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(@@) Andreas S. Wetzel E-mail: mickey@deadline.snafu.de
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