Re: [realtime kernel 2.6.21-rt2 and up] Extremely slow bootup for x86_64

On Mon, 2007-05-21 at 10:11 -0500, Frank Sorenson wrote:
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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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