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Subject: Re: [realtime kernel 2.6.21-rt2 and up] Extremely slow bootup for
	x86_64
From: Thomas Gleixner <tglx@linutronix.de>
To: Frank Sorenson <frank@tuxrocks.com>
Cc: Maarten Maathuis <madman2003@gmail.com>, linux-kernel@vger.kernel.org
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Date: Mon, 21 May 2007 18:04:34 +0200
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On Mon, 2007-05-21 at 10:11 -0500, Frank Sorenson wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Thomas Gleixner wrote:
> > On Mon, 2007-05-21 at 00:00 -0500, Frank Sorenson wrote:
> > 
> >> I see the slow bootup as well, even with 2.6.22-rc2-hrt1.  It takes at
> >> least 5 times as long to boot, for X to start, to login, etc.
> > 
> > Can you provide me your .config and a boot log (please enable
> > CONFIG_PRINTK_TIME and add "apic=verbose" to the kernel command line).
> > 
> > Can you also try with "hpet=disable" ?
> 
> All attached.  With "hpet=disable", it's still slow (clocksource becomes
> acpi_pm).

> [   23.159166] Bluetooth: HCI device and connection manager initialized
> [   23.159170] Bluetooth: HCI socket layer initialized
> [   23.159179] BUG: at mm/slab.c:777 __find_general_cachep()
> [   23.159181] 
> [   23.159182] Call Trace:
> [   23.159190]  [<ffffffff81097a67>] __kmalloc+0xa7/0xe0
> [   23.159195]  [<ffffffff810238dd>] cache_k8_northbridges+0x9d/0x120
> [   23.159200]  [<ffffffff814ddce3>] gart_iommu_init+0x33/0x5b0
> [   23.159205]  [<ffffffff811d4027>] class_register+0x177/0x180
> [   23.159210]  [<ffffffff814d8379>] pci_iommu_init+0x9/0x20
> [   23.159214]  [<ffffffff814cf6cc>] kernel_init+0x14c/0x320
> [   23.159218]  [<ffffffff8100b1b8>] child_rip+0xa/0x12
> [   23.159223]  [<ffffffff81184150>] acpi_ds_init_one_object+0x0/0x7c
> [   23.159227]  [<ffffffff814cf580>] kernel_init+0x0/0x320
> [   23.159230]  [<ffffffff8100b1ae>] child_rip+0x0/0x12

Hmm, other than this gem there is nothing obvious in the boot log. Does
the box boot normal with 2.6.22-rc2 ? 

Where does the slowness start ? Right from the beginning or later in the
boot process ?

	tglx


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