On 10-Nov-2003 Marius Strobl wrote: > 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. Peter has seen this on an amd64 machine. It seems we can get an interrupt from the AT PIC before we get a chance to program the PICs to mask all their inputs. > <...> > > 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.log > -- John Baldwin <jhb_at_FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/Received on Mon Nov 10 2003 - 09:40:50 UTC
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