Messages in this thread Patch in this message | | | From | Karsten Wiese <> | Subject | Re: Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24 | Date | Tue, 28 Jun 2005 19:27:43 +0200 |
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Hi Ingo,
suffering (not really ;-) double-rated IO-APIC level-interrupts I found the following patch as a solution:
--- arch/i386/kernel/io_apic.c~ 2005-06-28 19:07:49.000000000 +0200 +++ arch/i386/kernel/io_apic.c 2005-06-28 19:07:49.000000000 +0200 @@ -1959,6 +1959,7 @@ static void mask_and_ack_level_ioapic_irq(unsigned int irq) { move_irq(irq); + mask_IO_APIC_irq(irq); ack_APIC_irq(); } --- kernel/irq/handle.c~ 2005-06-28 19:19:32.000000000 +0200 +++ kernel/irq/handle.c 2005-06-28 19:19:32.000000000 +0200 @@ -214,7 +214,6 @@ * hardirq redirection to the irqd process context: */ if (redirect_hardirq(desc)) { - desc->handler->disable(irq); goto out_no_end; }
it works here on a PREEMPT_RT 2.6.12-RT-V0.7.50-29 base. Level-interrupts are sanely rated again. Didn't check, if the patch breaks XT-PIC mode, which works ok without the patch. Mainline shows the same effect here (VIA K8T800 UP), didn't dig there yet. thanks, Karsten
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