AMD 3200 - Athlon 64 2.0 GHz Processor Manual page 67

Rev October Revision Guide for AMD Family h Models h- Fh Processors
IBS Sampling of Instruction Fetches May Be Uneven
Description
Instructions selected for instruction-based sampling IBS of fetch performance Fetch Control IbsFetchEn
MSRC b may be sampled unevenly when the instruction fetch stream is redirected e g due to
a branch taken
Potential Effect on System
Performance monitoring software may not receive even unbiased IBS sampling of the instruction fetch stream
However IBS can still be used effectively for identifying performance issues associated with specific
instructions The sampling bias makes IBS less effective for measuring the statistical distribution of operations
and events
Suggested Workaround
None
Fix Planned
No fix planned
Product Errata