AMD Athlon 6 Specifications download pdf (Page 43)

Product Errata 43

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

25759 Rev. 3.79 July 2009

81 Cache Coherency Problem with Hardware Prefetching and

Streaming Stores

Description

If the processor's hardware prefetch mechanism initiates a cache line prefetch at approximately the

same time as a streaming store (MOVNT* or MASKMOV*) is performed to that same address, then

a stale copy of that line may be loaded into the cache.

Potential Effect on System

Cache coherency failure leading to unpredictable system failure. This erratum affects both

uniprocessor and multiprocessor configurations. It has only ever been observed in a randomized

diagnostic environment.

Suggested Workaround

BIOS should set DC_CFG.DIS_SMC_CHK_BUF (bit 10 of MSR 0xC001_1022) to disable the SMC

check buffer for streaming stores. No loss of functionality occurs as a result of setting this bit.

Fix Planned

Yes

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AMD Athlon 6 Specifications Page 43