Specifications

28 Product Errata
25759 Rev. 3.79 July 2009
Revision Guide for AMD Athlon™ 64 and AMD Opteron™ Processors
63 TLB Flush Filter Causes Coherency Problem in Multiprocessor
Systems
Description
If the TLB flush filter is enabled in a multiprocessor configuration, coherency problems may arise
between the page tables in memory and the translations stored in the on-chip TLBs. This can result in
the possible use of stale translations even after software has performed a TLB flush.
Potential Effect on System
Unpredictable system failure.
Suggested Workaround
In MP systems, disable the TLB flush filter by setting HWCR.FFDIS (bit 6 of MSR 0xC001_0015).
Fix Planned
Yes