Steven Seeger wrote:
I used the idle=poll option so I'm running the tsc now, and irq0 handlerstill has a lot of overhead.CPU PID MSW CSW PF STAT %CPU NAME0 0 0 2 0 00500080 94.2 ROOT 0 0 0 1 0 00100082 0.0 sound task 0 0 0 1 0 00100082 0.0 tone task 0 0 0 775585 0 00000000 5.6 IRQ0: [timer]I'm seeing about 17,000 context switches a second for IRQ0. Sound task and tone task are doing nothing. They're just blocked.
Ah! That could mean the timer gets misprogrammed, fires too early and thus too often. I had this effect on an standard PC when we used a slightly wrong APIC frequency. Do you use the APIC? -> /proc/xenomai/timer
Also this effect can nicely be confirmed via LTTng traces. Jan
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