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

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Date:	Sun, 9 Nov 2008 01:06:04 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Lukas Hejtmanek <xhejtman@....muni.cz>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Bootup time regression from 2.6.27 to 2.6.28-rc3+

On Tuesday, 4 of November 2008, Lukas Hejtmanek wrote:
> Hello Rafael,

Hi,

> not sure whether this is already reported or not. However, in 2.6.28-rc3
> I discovered about 10 secs delay before mounting the root fs and running init
> (not sure whether the delay is caused by mount or init). It did not appear in
> 2.6.27. I did not try any previous 2.6.28-rcX.

Added to the list of recent regressions as
http://bugzilla.kernel.org/show_bug.cgi?id=11987

Thanks,
Rafael


> This is from dmesg in 2.6.28-rc3. 
> 
> [    7.880966] IBM TrackPoint firmware: 0x0e, buttons: 3/3
> [    8.103116] input: TPPS/2 IBM TrackPoint as
> /devices/platform/i8042/serio1/serio2/input/input7
> [   28.993523] kjournald starting.  Commit interval 5 seconds
> [   28.993581] EXT3-fs: mounted filesystem with ordered data mode.
> [   28.993638] VFS: Mounted root (ext3 filesystem) readonly.
> [   28.993675] Freeing unused kernel memory: 332k freed
> [   37.697648] uhci_hcd: USB Universal Host Controller Interface driver
> [   37.697740] uhci_hcd 0000:00:1a.0: PCI INT A -> GSI 20 (level, low) -> IRQ
> 20
> [   37.697779] uhci_hcd 0000:00:1a.0: setting latency timer to 64
> [   37.697785] uhci_hcd 0000:00:1a.0: UHCI Host Controller
> [   37.698005] drivers/usb/core/inode.c: creating file 'devices'
> [   37.698008] drivers/usb/core/inode.c: creating file '001'
> [   37.698131] uhci_hcd 0000:00:1a.0: new USB bus registered, assigned bus
> number 1
> [   37.698176] uhci_hcd 0000:00:1a.0: detected 2 ports
> [   37.698205] uhci_hcd 0000:00:1a.0: uhci_check_and_reset_hc: cmd = 0x0000
> 
> 
> This is from 2.6.27 kernel:
> [    8.215972] IBM TrackPoint firmware: 0x0e, buttons: 3/3
> [    8.452174] input: TPPS/2 IBM TrackPoint as /devices/platform/i8042/serio1/serio2/input/input7
> [    9.016605] kjournald starting.  Commit interval 5 seconds
> [    9.016634] EXT3-fs: mounted filesystem with ordered data mode.
> [    9.016663] VFS: Mounted root (ext3 filesystem) readonly.
> [    9.016756] Freeing unused kernel memory: 296k freed
> [   18.963410] HDA Intel 0000:00:1b.0: PCI INT B -> GSI 17 (level, low) -> IRQ 17
> [   18.963461] hda_intel: probe_mask set to 0x1 for device 17aa:20ac
> [   18.969726] USB Universal Host Controller Interface driver v3.0
> [   18.987703] e1000e: Intel(R) PRO/1000 Network Driver - 0.3.3.3-k6
> [   18.987732] e1000e: Copyright (c) 1999-2008 Intel Corporation.
> [   19.023978] sdhci: Secure Digital Host Controller Interface driver
> [   19.024017] sdhci: Copyright(c) Pierre Ossman
> [   19.084812] input: PC Speaker as /devices/platform/pcspkr/input/input8
> [   19.366304] e1000e 0000:00:19.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
> [   19.372539] ACPI: WMI: Mapper loaded
> [   19.570065] 0000:00:19.0: eth0: (PCI Express:2.5GB/s:Width x1) 00:1a:6b:d2:bd:81
> [   19.570105] 0000:00:19.0: eth0: Intel(R) PRO/1000 Network Connection
> [   19.570172] 0000:00:19.0: eth0: MAC: 4, PHY: 6, PBA No: ffffff-0ff
> [   19.570301] uhci_hcd 0000:00:1a.0: PCI INT A -> GSI 20 (level, low) -> IRQ 20
> [   19.570343] uhci_hcd 0000:00:1a.0: UHCI Host Controller
> 



-- 
Everyone knows that debugging is twice as hard as writing a program
in the first place.  So if you're as clever as you can be when you write it,
how will you ever debug it? --- Brian Kernighan
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