On 01/21/2013 03:38 PM, Santosh Shilimkar wrote: > On Monday 21 January 2013 07:47 PM, Daniel Lezcano wrote: >> >> Hi All, >> >> I have a question regarding the behavior of cpuidle on pandaboard. >> >> 1. cpuidle is enabled >> >> 2. The deep idle states seem to be reach >> >> for i in $(find /sys/devices/system/cpu -name "usage"); do echo "$i : >> $(cat $i)"; done >> /sys/devices/system/cpu/cpu0/cpuidle/state0/usage : 7049 >> /sys/devices/system/cpu/cpu0/cpuidle/state1/usage : 17 >> /sys/devices/system/cpu/cpu0/cpuidle/state2/usage : 1341 >> /sys/devices/system/cpu/cpu1/cpuidle/state0/usage : 6318 >> /sys/devices/system/cpu/cpu1/cpuidle/state1/usage : 17 >> /sys/devices/system/cpu/cpu1/cpuidle/state2/usage : 1341 >> >> 3. Regarding the cpuidle driver code : the "state1" and "state2" are >> coupled states where the broadcast timer is used instead of the local >> timer. I assume this is because they go down when we reach these idle >> states. >> > Thats correct. Local timer are not wakeup capable and hence we switch > to a wakeup capable broadcast timer. > >> 4. The content of /proc/interrupts shows no broadcast timer used at all. >> >> ... >> IPI1: 0 0 Timer broadcast interrupts >> ... >> >> Shouldn't be the broadcast timer used sometimes ? or did I miss >> something ? >> > There might be an issue with status updating. Just look for gptimer1 > interrupts. if they are incrementing then, broadcast is being used > but just the status update isn't happening some how. Is it the interrupt 69 ? 29: 293 395 GIC twd 41: 0 0 GIC l3-dbg-irq 42: 0 0 GIC l3-app-irq 44: 0 0 GIC DMA 69: 61 0 GIC gp_timer 88: 0 0 GIC i2c.9 89: 0 0 GIC i2c.10 93: 0 0 GIC i2c.11 94: 0 0 GIC i2c.12 106: 93 0 GIC OMAP UART2 169: 0 0 PRCM hwmod_io IPI0: 0 0 Timer broadcast interrupts IPI1: 1424 1260 Rescheduling interrupts IPI2: 0 0 Function call interrupts IPI3: 81 90 Single function call interrupts IPI4: 0 0 CPU stop interrupts Err: 0 > > regards > santosh > -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
