I am running 2 systems using the i7 2600 CPU with the Z68 chip set.
Specifically the P8Z68-V Pro mother board.  I had been running 6G of
memory in each system but changed the configuration after reading this
bug report to 8G on 1 and 4G on the other.  I am running Ubuntu 10.04.3
LTS 64bit on both systems.  Both are behaving the same as the others
listed above.  They have extremely high latency and very slow file
transfers.  I am running Intel Pro/1000 GT network cards.

dmesg output:

[  163.595546] irq 18: nobody cared (try booting with the "irqpoll" option)
[  163.595552] Pid: 0, comm: swapper Not tainted 2.6.32-37-generic #81-Ubuntu
[  163.595554] Call Trace:
[  163.595556]  <IRQ>  [<ffffffff810c6c1b>] __report_bad_irq+0x2b/0xa0
[  163.595567]  [<ffffffff810c6e1c>] note_interrupt+0x18c/0x1d0
[  163.595571]  [<ffffffff810c751d>] handle_fasteoi_irq+0xdd/0x100
[  163.595575]  [<ffffffff81014d12>] handle_irq+0x22/0x30
[  163.595580]  [<ffffffff8154804c>] do_IRQ+0x6c/0xf0
[  163.595583]  [<ffffffff81012b13>] ret_from_intr+0x0/0x11
[  163.595585]  <EOI>  [<ffffffff81311055>] ? acpi_idle_enter_bm+0x294/0x2c8
[  163.595594]  [<ffffffff8131104e>] ? acpi_idle_enter_bm+0x28d/0x2c8
[  163.595599]  [<ffffffff8143c207>] ? cpuidle_idle_call+0xa7/0x140
[  163.595604]  [<ffffffff81010e53>] ? cpu_idle+0xb3/0x110
[  163.595608]  [<ffffffff8153cbf8>] ? start_secondary+0xa8/0xaa
[  163.595610] handlers:
[  163.595612] [<ffffffffa00389d0>] (e1000_intr+0x0/0x120 [e1000])
[  163.595624] Disabling IRQ #18


If you require more information, log outputs, anything I can provide please ask.

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https://bugs.launchpad.net/bugs/843709

Title:
  IRQ handling issues on sandy bridge board

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