System freezes with SMP support enabled [Solved?]

[Aleksandr Melentiev]

Ok, it seems I have come down to a solution to my problem.
I have enabled an option in BIOS which is called 'PCI IRQs to IO-APIC
Mapping'. It uses 24 IO-APIC pins to describe PCI interrupts instead of
standard 16.
With this enabled, I have not encountered any problems so far that I have
described earlier.

Regards,
Alex

----- Original Message -----
From: "John Baldwin" <jhb at FreeBSD.org>
To: "Terry Lambert" <tlambert2 at mindspring.com>
Cc: <freebsd-smp at freebsd.org>; "Aleksandr Melentiev" <tzap at pacbell.net>
Sent: Wednesday, April 09, 2003 9:00 AM
Subject: Re: System freezes with SMP support enabled


>
> On 09-Apr-2003 Terry Lambert wrote:
> > What are both network cards?  Are they fxp?
> >
> > There are a couple of possibilities to consider...
> >
> > The first is that if both cards are identical (same vendor, etc.),
> > you might want to use a network card from a different vendor, to
> > make sure it's not the network card driver.
>
> This sounds like a sensible possibility and a worthy test.
>
> > Second, it seems to me that there's a possibility for a deadlock
> > if an interrupt comes in on one CPU, and an ithread to handle it
> > is scheduled to run on a different CPU.  You may want to try using
> > SCHED_4BSD to see if that changes anything.
>
> Huh?  Where in the code do you see this happening exactly?  All the
> bits you should need to look at for this are in ithread_schedule()
> and ithread_loop() in sys/kern/kern_intr.c.  Not only that, but 4.8
> doesn't have ithreads so I doubt seriously that this is causing the
> lockups on 4.x.
>
> --
>
> John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
> "Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/