linux-kernel - Re: Bootup time regression from 2.6.27 to 2.6.28-rc3+

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Message-Id: <1226324750.4212.2.camel@hidalgo>
Date:	Mon, 10 Nov 2008 14:45:50 +0100
From:	Yves-Alexis Perez <corsac@...ian.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Lukas Hejtmanek <xhejtman@....muni.cz>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Marcin Slusarz <marcin.slusarz@...il.com>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	torvalds@...ux-foundation.org, elendil@...net.nl
Subject: Re: Bootup time regression from 2.6.27 to 2.6.28-rc3+

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@....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@...algo: 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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