I'm disabled USB and the COM ports in the BIOS, at the Boot options - system parameters disabled all but the SMP.
Code:
2011/06/22 17:59:59     kernel:[  648.040035] Pid: 0, comm: swapper Not tainted 2.6.27.39-oe64-00000-g5ec1914 #49

2011/06/22 17:59:59     kernel:[  648.040037] 

2011/06/22 17:59:59     kernel:[  648.040037] Call Trace:

2011/06/22 17:59:59     kernel:[  648.040039]  <IRQ>  [<ffffffff80234f6d>] warn_slowpath+0xcd/0x110

2011/06/22 17:59:59     kernel:[  648.040045]  [<ffffffff8022af87>] source_load+0x37/0x70

2011/06/22 17:59:59     kernel:[  648.040049]  [<ffffffff8041cd39>] __next_cpu+0x19/0x30

2011/06/22 17:59:59     kernel:[  648.040051]  [<ffffffff8022ca4a>] find_busiest_group+0x19a/0x850

2011/06/22 17:59:59     kernel:[  648.040054]  [<ffffffff8022bc5d>] place_entity+0xad/0xe0

2011/06/22 17:59:59     kernel:[  648.040056]  [<ffffffff8022bc5d>] place_entity+0xad/0xe0

2011/06/22 17:59:59     kernel:[  648.040058]  [<ffffffff8022e4fc>] enqueue_task_fair+0xfc/0x120

2011/06/22 17:59:59     kernel:[  648.040060]  [<ffffffff8022ad23>] enqueue_task+0x13/0x30

2011/06/22 17:59:59     kernel:[  648.040062]  [<ffffffff8022add8>] activate_task+0x28/0x40

2011/06/22 17:59:59     kernel:[  648.040065]  [<ffffffff8022e795>] try_to_wake_up+0xe5/0x190

2011/06/22 17:59:59     kernel:[  648.040068]  [<ffffffff8024fe98>] getnstimeofday+0x48/0xe0

2011/06/22 17:59:59     kernel:[  648.040071]  [<ffffffff802120f9>] read_tsc+0x9/0x20

2011/06/22 17:59:59     kernel:[  648.040073]  [<ffffffff8024fe98>] getnstimeofday+0x48/0xe0

2011/06/22 17:59:59     kernel:[  648.040075]  [<ffffffff804225ae>] strlcpy+0x4e/0x80

2011/06/22 17:59:59     kernel:[  648.040078]  [<ffffffff805f7c53>] dev_watchdog+0x203/0x210

2011/06/22 17:59:59     kernel:[  648.040080]  [<ffffffff802120f9>] read_tsc+0x9/0x20

2011/06/22 17:59:59     kernel:[  648.040083]  [<ffffffff8024fe98>] getnstimeofday+0x48/0xe0

2011/06/22 17:59:59     kernel:[  648.040085]  [<ffffffff805f7a50>] dev_watchdog+0x0/0x210

2011/06/22 17:59:59     kernel:[  648.040088]  [<ffffffff8023e92f>] run_timer_softirq+0x15f/0x1c0

2011/06/22 17:59:59     kernel:[  648.040091]  [<ffffffff8023a2d3>] __do_softirq+0x73/0xf0

2011/06/22 17:59:59     kernel:[  648.040093]  [<ffffffff8020d41c>] call_softirq+0x1c/0x30

2011/06/22 17:59:59     kernel:[  648.040095]  [<ffffffff8020ec35>] do_softirq+0x35/0x70

2011/06/22 17:59:59     kernel:[  648.040097]  [<ffffffff8023a259>] irq_exit+0x89/0x90

2011/06/22 17:59:59     kernel:[  648.040101]  [<ffffffff8021b7c0>] smp_apic_timer_interrupt+0x80/0xc0

2011/06/22 17:59:59     kernel:[  648.040103]  [<ffffffff8020cef6>] apic_timer_interrupt+0x66/0x70

2011/06/22 17:59:59     kernel:[  648.040105]  <EOI>  [<ffffffff8021b3f0>] lapic_next_event+0x0/0x10

2011/06/22 17:59:59     kernel:[  648.040109]  [<ffffffff80212e51>] mwait_idle+0x41/0x50

2011/06/22 17:59:59     kernel:[  648.040111]  [<ffffffff8020ad74>] cpu_idle+0x44/0x70

2011/06/22 17:59:59     kernel:[  648.040112]