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SubjectRe: Bootup time regression from 2.6.27 to 2.6.28-rc3+
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On dim, 2008-11-09 at 13:24 -0800, Arjan van de Ven wrote:
> On Sun, 9 Nov 2008 21:34:32 +0100
> Lukas Hejtmanek <xhejtman@ics.muni.cz> wrote:
>
> > On Sun, Nov 09, 2008 at 12:28:35PM -0800, Arjan van de Ven wrote:
> > > for me, the plan is that we need to get Thomas' fixes tested by
> > > someone who can reproduce this very reliably. If they fix it, great.
> >
> > as for me, 100% of boots require a key hit to proceed in 2.6.28-rc3
> > (more precisely, the current git head).
> >
>
> it would be greatly appreciated if those that see this issue can test
> the patch below (which is a combo patch of thomas' fixes, to make
> testing easier) and confirm if this fixes the hangs.
> If they do fix the issue we don't need to disable anything and get better power
> savings as bonus as well.

Under 2.6.28-rc4 the bootime seems ok, but I have way too much powertop
wakups:

corsac@hidalgo: sudo powertop -d
PowerTOP 1.10 (C) 2007, 2008 Intel Corporation

Collecting data for 15 seconds


Cn Avg residency
C0 (cpu running) ( 4,3%)
C0 0,0ms ( 0,0%)
C1 0,0ms ( 0,0%)
C2 0,5ms ( 0,3%)
C4 2,8ms (95,5%)
P-states (frequencies)
2,21 Ghz 1,3%
2,21 Ghz 0,0%
1,60 Ghz 0,5%
800 Mhz 98,1%
Wakeups-from-idle per second : 346,5 interval: 15,0s
Power usage (ACPI estimate): 15,1W (1,6 hours)
Top causes for wakeups:
74,1% (278,5) <interrupt> : extra timer interrupt
8,8% ( 33,2) <kernel IPI> : Rescheduling interrupts
4,1% ( 15,3) <interrupt> : uhci_hcd:usb5, yenta,
i915@pci:0000:00:02.0
3,6% ( 13,7) <interrupt> : iwlagn
1,7% ( 6,5) <interrupt> : acpi
1,1% ( 4,1) <kernel module> : usb_hcd_poll_rh_status
(rh_timer_func)
1,0% ( 3,9) <interrupt> : ahci

Cheers,
--
Yves-Alexis
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