Messages in this thread | | | Date | Tue, 6 May 2003 06:41:57 -0400 (EDT) | From | Zwane Mwaikambo <> | Subject | Re: 2.5.68-mmX: Drowning in irq 7: nobody cared! |
| |
On Tue, 6 May 2003, Alan Cox wrote:
> With APIC at least it doesnt suprise me the least. The IRQ hack seems > extremely racey. Remember on most systems (especially with PIII type > APIC) IRQ delivery is asynchronous to the bus so you get > > IRQ arrives > sound card > loop > clean up IRQ > IRQ sent > still more work, do it > done > HANDLED > > IRQ arrives > sound card > Umm duh no work for me > NOT HANDLED > > Whine > > For anything where you get pairs of close IRQ's
Shouldn't this also be observed more easily on P4/xAPIC since you can have a pending vector in the IRR and ISR whilst the core processes one.
Zwane -- function.linuxpower.ca - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |