On Thu, Nov 06, 2003 at 12:22:45PM -0500, John Baldwin wrote: > > On 06-Nov-2003 Harti Brandt wrote: > > JB>I figured out what is happenning I think. You are getting a spurious > > JB>interrupt from the 8259A PIC (which comes in on IRQ 7). The IRR register > > JB>lists pending interrupts still waiting to be serviced. Try using > > JB>'options NO_MIXED_MODE' to stop using the 8259A's for the clock and see if > > JB>the spurious IRQ 7 interrupts go away. > > > > Ok, that seems to help. Interesting although why do these interrupts > > happen only with a larger HZ and when the kernel is doing printfs (this > > machine has a serial console). I have also not tried to disable SIO2 and > > the parallel port. > > Can you also try turning mixed mode back on and using > http://www.FreeBSD.org/~jhb/patches/spurious.patch > > You should get some stray IRQ 7's in the vmstat -i output as well as a few > printf's to the kernel console. > I think I'm seeing something related here, with the old interrupt code I got: <...> Hit [Enter] to boot immediately, or any other key for command prompt. Booting [/boot/kernel/kernel]... ACPI autoload failed - no such file or directory stray irq 7 ^^^^^^^^^^^ Copyright (c) 1992-2003 The FreeBSD Project. <...> With the new interrupt code I get: <...> OK boot cpuid = 0; apic id = 00 instruction pointer = 0x0:0xa00 stack pointer = 0x0:0xffe frame pointer = 0x0:0x0 code segment = base 0x0, limit 0x0, type 0x0 = DPL 0, pres 0, def32 0, gran 0 processor eflags = interrupt enabled, vm86, IOPL = 0 current process = 0 () kernel: type 30 trap, code=0 Stopped at 0xa00: cli db> tr (null)(0,0,0,0,0) at 0xa00 <...> However, if I enter 'continue' at the DDB prompt it continues to boot and the system seems to runs fine: <...> db> continue SMAP type=01 base=0000000000000000 len=000000000009f400 SMAP type=02 base=000000000009f400 len=0000000000000c00 SMAP type=02 base=00000000000d0000 len=0000000000030000 SMAP type=01 base=0000000000100000 len=000000001fdf0000 SMAP type=03 base=000000001fef0000 len=000000000000f000 SMAP type=04 base=000000001feff000 len=0000000000001000 SMAP type=01 base=000000001ff00000 len=0000000000080000 SMAP type=02 base=000000001ff80000 len=0000000000080000 SMAP type=02 base=00000000fec00000 len=0000000000004000 SMAP type=02 base=00000000fee00000 len=0000000000001000 SMAP type=02 base=00000000fff80000 len=0000000000080000 Copyright (c) 1992-2003 The FreeBSD Project. <...> Neiter the spurious interrupt patch nor setting 'options NO_MIXED_MODE' makes a difference. This is on a Tyan Tiger MPX S2466N-4M board, a full verbose boot log is at: http://quad.zeist.de/newintr.logReceived on Mon Nov 10 2003 - 07:25:48 UTC
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