On Sun, 2004-08-01 at 21:30 +0200, Ingo Molnar wrote:
> here's the latest version of the voluntary-preempt patch:
> 
> http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc2-O2
> 
> this patch is mainly a stabilization effort. I dropped the irq-threads
> code added in -M5 and rewrote it from scratch based on -L2 - it is
> simpler and should be more robust.
> 
> The same /proc/irq/* configuration switches are still present, but i
> added the following additional rule: if _any_ handler of a given IRQ is
> marked as non-threaded then all handlers will be executed non-threaded
> as well.
> 
> E.g. if you have the following handlers on IRQ 10:
> 
>  10:      11584   IO-APIC-level  eth0, eth1, eth2
> 
> and you change /proc/irq/16/eth1/threaded from 1 to 0 then the eth0 and
> eth2 handlers will be executed non-threaded as well. (This rule only
> enforces what the hardware enforces anyway, none of the previous patches
> allowed true separation of these handlers.)
> 
> i also changed the IO-APIC level-triggered code to be robust when
> redirection is done. The noapic workaround should not be necessary
> anymore.
> 
> the keyboard lockups are now hopefully all gone too - i've tested
> IO-APIC and non-IO-APIC setups as well and NumLock/ScrollLock works fine
> in all sorts of workloads.
> 
> Let me know if you still have any problems.

I'll be away on vacations for about two weeks, but before leaving, I
wanted to test run 2.6.8-rc2-bk11 plus voluntary-preempt-O2 on my P4 box
with both ACPI and IO/APIC enabled, voluntary-preempt=3 and preempt=1
and it seems to be working fine (I still haven't seen any hard locks).

# cat /proc/interrupts
           CPU0
  0:     114044    IO-APIC-edge  timer
  1:        497    IO-APIC-edge  i8042
  8:          1    IO-APIC-edge  rtc
  9:          0   IO-APIC-level  acpi
 14:       9289    IO-APIC-edge  ide0
 15:         54    IO-APIC-edge  ide1
 17:       1299   IO-APIC-level  Intel 82801BA-ICH2
 19:      13408   IO-APIC-level  uhci_hcd
 20:        279   IO-APIC-level  eth0
 23:          0   IO-APIC-level  uhci_hcd
NMI:          0
LOC:     113967
ERR:          0
MIS:          0

# grep . /proc/irq/*/*/threaded
/proc/irq/14/ide0/threaded:1
/proc/irq/15/ide1/threaded:1
/proc/irq/17/Intel 82801BA-ICH2/threaded:1
/proc/irq/19/uhci_hcd/threaded:1
/proc/irq/1/i8042/threaded:1
/proc/irq/20/eth0/threaded:1
/proc/irq/23/uhci_hcd/threaded:1
/proc/irq/8/rtc/threaded:1
/proc/irq/9/acpi/threaded:1


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