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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

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AMD Athlon 6 Specifiche Pagina 28