Messages in this thread | | | Date | Sun, 27 Nov 2011 21:13:28 +0100 (CET) | From | "Nicolas Kalkhof" <> | Subject | Too many poll_idle cpu calls in kernel 3.2 rc-series |
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the kernel v3.2 series shows excessive poll_idle calls during system idle phases causing the cpu (mobile i7 2620M) to heat up and draw additional 10% more power. All kernel versions between 3.2-rc1 and 3.2-rc3 are affected. Perf Top and Powertop both show the same issue. I've posted a similar bug report before: http://marc.info/?l=linux-kernel&m=132164909313594&w=2 and used perf top -U to verify the poll_idle calls as requested.
dmesg and kernel .config attached.
Could someone please confirm this issue?
Thanks and Regards Nic
perf top -U shows: Events: 30K cycles 97.88% [kernel] [k] poll_idle 0.17% [kernel] [k] sdhci_irq 0.08% [kernel] [k] unix_poll 0.06% [kernel] [k] _raw_spin_lock_irqsave 0.06% [kernel] [k] page_fault 0.05% [kernel] [k] fget_light 0.05% [kernel] [k] format_decode 0.04% [kernel] [k] kmem_cache_alloc 0.04% [kernel] [k] clear_page 0.04% [kernel] [k] _raw_spin_unlock_irqrestore 0.03% [kernel] [k] do_select 0.03% [kernel] [k] seq_printf 0.03% [kernel] [k] vfs_read 0.03% [kernel] [k] _raw_spin_lock 0.03% [kernel] [k] vsnprintf 0.03% [kernel] [k] number.clone.1 0.03% [kernel] [k] fput
Powertop shows: n Avg residency P-states (frequencies) C0 (cpu running) ( 5.4%) Turbo Mode 1.5% polling 1.8ms (94.6%) 2.71 Ghz 0.1% C1 mwait 0.0ms ( 0.0%) 2.21 Ghz 0.1% C2 mwait 0.0ms ( 0.0%) 1400 Mhz 0.1% C3 mwait 0.0ms ( 0.0%) 800 Mhz 98.2% C4 mwait 0.0ms ( 0.0%) Wakeups-from-idle per second : 529.4 interval: 5.0s
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