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[Rafael David Tinoco <tinhocas@xxxxxxxxx>]

We still have IRQ remapping enabled on these servers:

Nov 27 21:58:47 sgsxeris001 kernel: [ 0.098712] Enabled IRQ remapping in
xapic mode

So the proper CMDLINE for kernel is to have:

intremap=no_x2apic_optout OR intremap=off (safer)

AND

nox2apic

TOGETHER --> "nox2apic intremap=off" (best option for these Proliant
Servers)

Judging by HP documentation:

"""
HP ProLiant Servers do not support hardware interrupt remapping. Please use the following command to override hardware
interrupt remapping on Intel platforms:
Boot kernel with intremap=no_x2apic_optout option
"""

Following LP: #1318551 for these servers we should have the cmdline as:

"intel_idle.max_cstate=0 nox2apic intremap=off"

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https://bugs.launchpad.net/bugs/1398497

Title:
  HP Proliant Serverrs - DL360 and DL380 Gen8 - Precise Kernel Panic -
  General Protection Fault

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Precise:
  Incomplete

Bug description:
  It was brought to my attention the following situation:

  """
  We massively upgraded our Ubuntu 12.04 servers (most of them are HP
  DL360p Gen8 or DL380 Gen8) to 3.2.0-67 kernel And in the last 2-3
  days we already had to reboot 5 of them because they completely hang

  Some of them had the following messages under syslog :
  kernel: [384707.675479] general protection fault: 0000 [#5666] SMP

  others had :
  kernel: [950725.612724] BUG: unable to handle kernel paging request

  All of them have this also :
  your BIOS is broken and requested that x2apic be disabled
  """

  Comments bellow

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