Hardware / Software:
ProTools 10.3.x HDX
Mac OS 10.8 (Mountain Lion / Kitty)
Issue appears to be a combination of which slots you use and the number of processors you have.
1. Depending on the Mac, the PCI express slots have different data rate supports on the slots.
If you have a 2008 Mac Pro:
- Slots 1 and 2 are x16 Revision 2 slots.
- Slots 3 and 4 are x4 Revision 1 slots.
If you have a 2009, 2010, or 2012 Mac Pro:
- Slots 1 and 2 are x16 Revision 2 slots.
- Slots 3 and 4 are x4 Revision 2 slots.
Note:
The Expansion Slot Utility app in /System/Library/CoreServices won't be able to adjust as the lanes for each slot are permanently set.
You have to make sure you don't place a slow PCIx Rev 1 slot card in the same slot pair (e.g. slots 1 and 2) as a Rev 2 (ex. x16 R2.0 card), or you will slow down the R2 card to R1, which ProTools won't like.
2. If you are running buffers lower than 256, set the Host Processors to the actual number of physical processor cores.
(The math is 2 x #cores. Example: 6 processors x 2 = 12 Host Processors)
See this Avid link:
http://avid.force.com/pkb/articles/en_US/Troubleshooting/DAE-9171-and-other-CPU-Overload-Errors-at-Low-Buffer-Sizes?retURL=%2Fpkb%2Farticles%2Fen_US%2FTroubleshooting%2FDAE-9171-and-other-CPU-Overload-Errors-at-Low-Buffer-Sizes&popup=true
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