Messages in this thread Patch in this message | | | Subject | Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.25-1 | From | Shane Shrybman <> | Date | Fri, 12 Nov 2004 18:44:54 -0500 |
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On Fri, 2004-11-12 at 15:13, Ingo Molnar wrote: > * Shane Shrybman <shrybman@aei.ca> wrote: > > > V0.7.25-1 has been stable here with the ivtv driver for 11 hrs. No > > sign of the ide dma time out issue either. Out of curiosity, do we > > know what solved that problem? > > could you try the attached patch - does it trigger the DMA timeouts > again? There were 3 changes to the IOAPIC code that could have affected > your dma-timeout problem, this patch reverts all of them. >
Ok, V0.7.25-1 seems to have resolved the DMA timeout problem.
I don't know how useful it is but this patch also seems to have resolved that problem.
--- linux-2.6.10-rc1mm3-RT3/arch/i386/kernel/io_apic.c 2004-11-11 16:41:37.000000000 -0500 +++ linux-2.6.10-rc1mm3-RT3.T5/arch/i386/kernel/io_apic.c 2004-11-12 17:54:31.000000000 -0500 @@ -156,7 +156,7 @@ * generate lots of spurious interrupts due to the POST-ed write not * reaching the IOAPIC before the IRQ is ACK-ed in the local APIC. */ -#define IOAPIC_POSTFLUSH +//#define IOAPIC_POSTFLUSH static void __modify_IO_APIC_irq (unsigned int irq, unsigned long enable, unsigned long disable) { @@ -1940,7 +1940,7 @@ * unacked local APIC is dangerous on SMP as it can prevent the * delivery of IPIs and can thus cause deadlocks.) */ -#if defined(CONFIG_PREEMPT_HARDIRQS) && defined(CONFIG_SMP) +#if defined(CONFIG_PREEMPT_HARDIRQS) static void mask_and_ack_level_ioapic_irq(unsigned int irq) { Regards,
Shane
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