View source for CentOS IOMMU related errors on system boot

[[Main Page|Home]] > [[CentOS]] > [[CentOS 6.x]] > [[Server administration tips and tricks]] > [[CentOS IOMMU related errors on system boot]]

On booting CentOS, RHEL or Fedora it is possible to receive large number of messages of
<pre>
   PTE read access is not set
</pre>
   
This is caused by some problem with IOMMU unit.  This can be avoided (not solved) by disabling IOMMU altogether.  This requires editing /etc/grub/grub.conf file and removing
<pre>
   intel_iommu=on
   amd_iommu=on
</pre>
options. 

Note that ignoring these message flooding is not a good idea.  This will cause /var/log/messages flie to become very big, system to be very slow due to continuous disk write of these log messages and would make debugging things that require /var/log/messages to be read very difficult.

This was learned from http://www.gossamer-threads.com/lists/linux/kernel/1647852




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