linux-kernel - DMAR log spam

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Date:	Fri, 23 Dec 2011 11:32:45 +0100
From:	Ortwin Glück <odi@....ch>
To:	linux-kernel@...r.kernel.org
Subject: DMAR log spam

Hi,

3.2-rc6 with INTEL_IOMMU and INTEL_IOMMU_DEFAULT_ON fills the log with 
these lines after starting X with the proprietariy nvidia driver. The 
system becomes unusable after that (appears frozen but I guess it's just 
too busy writing this log).

Ortwin

Dec 23 11:20:43 ortwin-hp kernel: DMAR:[fault reason 02] Present bit in 
context entry is clear
Dec 23 11:20:43 ortwin-hp kernel: DRHD: handling fault status reg 2
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[DMA Read] Request device 
[01:00.0] fault addr 22e2a1000
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[fault reason 02] Present bit in 
context entry is clear
Dec 23 11:20:43 ortwin-hp kernel: DRHD: handling fault status reg 2
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[DMA Read] Request device 
[01:00.0] fault addr 22e2a1000
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[fault reason 02] Present bit in 
context entry is clear
Dec 23 11:20:43 ortwin-hp kernel: DRHD: handling fault status reg 2
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[DMA Read] Request device 
[01:00.0] fault addr 22e2a1000
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[fault reason 02] Present bit in 
context entry is clear
Dec 23 11:20:43 ortwin-hp kernel: DRHD: handling fault status reg 2
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[DMA Read] Request device 
[01:00.0] fault addr 22e2a1000
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[fault reason 02] Present bit in 
context entry is clear
Dec 23 11:20:43 ortwin-hp kernel: DRHD: handling fault status reg 2
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[DMA Read] Request device 
[01:00.0] fault addr 22e2a1000
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[fault reason 02] Present bit in 
context entry is clear
Dec 23 11:20:43 ortwin-hp kernel: DRHD: handling fault status reg 2
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[DMA Read] Request device 
[01:00.0] fault addr 22e2a1000
Dec 23 11:20:43 ortwin-hp kernel: DMAR:[fault reason 02] Present bit in 
context entry is clear
Dec 23 11:20:43 ortwin-hp kernel: DRHD: handling fault status reg 2

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