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Subject: Re: Bootup time regression from 2.6.27 to 2.6.28-rc3+
From: Yves-Alexis Perez <corsac@debian.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Lukas Hejtmanek <xhejtman@ics.muni.cz>, "Rafael J. Wysocki" <rjw@sisk.pl>,
       Marcin Slusarz <marcin.slusarz@gmail.com>, linux-kernel@vger.kernel.org,
       Thomas Gleixner <tglx@linutronix.de>, torvalds@linux-foundation.org,
       elendil@planet.nl
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Date: Mon, 10 Nov 2008 14:45:50 +0100
Message-Id: <1226324750.4212.2.camel@hidalgo>
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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:
>=20
> > 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.
> >=20
> > as for me, 100% of boots require a key hit to proceed in 2.6.28-rc3
> > (more precisely, the current git head).
> >=20
>=20
> 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=20

Collecting data for 15 seconds=20


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)=20
Top causes for wakeups:
  74,1% (278,5)       <interrupt> : extra timer interrupt=20
   8,8% ( 33,2)      <kernel IPI> : Rescheduling interrupts=20
   4,1% ( 15,3)       <interrupt> : uhci_hcd:usb5, yenta,
i915@pci:0000:00:02.0=20
   3,6% ( 13,7)       <interrupt> : iwlagn=20
   1,7% (  6,5)       <interrupt> : acpi=20
   1,1% (  4,1)   <kernel module> : usb_hcd_poll_rh_status
(rh_timer_func)=20
   1,0% (  3,9)       <interrupt> : ahci=20

Cheers,
--=20
Yves-Alexis

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