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 -- (__) (@@) Andreas S. Wetzel E-mail: mickey@deadline.snafu.de /-------\/ Utrechter Strasse 41 Web: http://deadline.snafu.de/ / | || 13347 Berlin Voice: <+4930> 456 81 68 * ||----|| Germany Fax/Data: <+4930> 455 19 57 ~~ ~~
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