On Mon, Dec 16, 2002 at 03:47:32PM +1100, Keith Owens wrote:
> On Mon, 16 Dec 2002 14:52:26 +1100,
> email@example.com wrote:
> >Running with nmi_watchdog=2 has made the problem a bit harder to
> >reproduce, but when it does hang it doesn't produce a trace (I left it
> >for several minutes just in case..). Checking /proc/interrupts after
> >boot shows around 16 NMIs, which I presume means that it's being used? -
> >although it didn't seem to be going up at anything like once every 5
> nmi_watchdog=2 should pop once per second, nmi_watchdog=1 pops HZ
> (usually 100) times per second. Anything less than once a second is
> not working. One possibility is CONFIG_X86_UP_APIC, it should be y for
> UP to use nmi_watchdog.
Interesting - I do have CONFIG_X86_UP_APIC set, and the nmi_watchdog is
doing _something_, because without it on the kernel commandline I get 0
> >Is it possible that I'm not seeing the trace because I'm using a VGA
> >virtual console rather than a real serial console?
> Depends on your boot parameters for console and the levels of console
> printk. Console output to X is unlikely to work, output to VGA
> (including virtual consoles) should work. Except that some
> distributions change printk levels and even redirect output to a
> different virtual console.
> cat /proc/cmdline should have no console setting or 'console=tty0'.
> Change boot options and reboot if necessary.
> cat /proc/sys/kernel/printk should report 6 4 1 7, if not then
> echo "6 4 1 7" > /proc/sys/kernel/printk
Ahh, that could be a problem, my system's default is "7 4 1 7".
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This archive was generated by hypermail 2b29 : Mon Dec 23 2002 - 22:00:12 EST