AMD Athlon 6 Specifications download pdf (Page 33)

Product Errata 33

Revision Guide for AMD Athlon™ 64 and AMD Opteron™ Processors

25759 Rev. 3.79 July 2009

69 Multiprocessor Coherency Problem with Hardware Prefetch

Mechanism

Description

If the on-chip hardware prefetch mechanism generates a prefetch with write intent for a cache line

that is also found to be present in the instruction cache, then the eventual prefetch response from the

system is incorrectly discarded by the processor.

In the event the prefetched line was transferred in the modified state from another processor’s cache,

that processor’s modified data is lost.

Potential Effect on System

Multiprocessor memory coherency issues leading to unpredictable system failure.

Suggested Workaround

In MP systems, set BU_CFG.WbPfSmcChkDis (bit 45 of MSR 0xC001_1023). No loss of

performance results from this workaround.

Fix Planned

Yes

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AMD Athlon 6 Specifications Page 33