Table of Contents
Advertisement
AAN36.
Core C6 May Clear Previously Logged TLB Errors
Problem:
Following an exit from core C6, previously logged TLB (Translation Lookaside Buffer)
errors in IA32_MCi_STATUS may be cleared.
Implication:
Due to this erratum, TLB errors logged in the associated machine check bank prior to
core C6 entry may be cleared. Provided machine check exceptions are enabled, the
machine check exception handler can log any uncorrectable TLB errors prior to core C6
entry. The TLB marks all detected errors as uncorrectable.
Workaround:
As long as machine check exceptions are enabled, the machine check exception
handler can log the TLB error prior to core C6 entry. This will ensure the error is logged
before it is cleared.
Status:
For the steppings affected, see the Summary Tables of Changes.
AAN37.
Performance Monitor Event MISALIGN_MEM_REF May Over Count
Problem:
The MISALIGN_MEM_REF Performance Monitoring (Event 05H) may over count
memory misalignment events, possibly by orders of magnitude.
Implication:
Software relying on MISALIGN_MEM_REF to count cache line splits for optimization
purposes may read excessive number of memory misalignment events.
Workaround:
None identified.
Status:
For the steppings affected, see the Summary Tables of Changes.
AAN38.
Changing the Memory Type for an In-Use Page Translation May Lead
to Memory-Ordering Violations
Problem:
Under complex microarchitectural conditions, if software changes the memory type for
data being actively used and shared by multiple threads without the use of semaphores
or barriers, software may see load operations execute out of order.
Implication:
Memory ordering may be violated. Intel has not observed this erratum with any
commercially available software.
Workaround:
Software should ensure pages are not being actively used before requesting their
memory type be changed.
Status:
For the steppings affected, see the Summary Tables of Changes.
AAN39.
Running with Write Major Mode Disabled May Lead to a System Hang
Problem:
With write major mode disabled, reads will be favored over writes and under certain
circumstances this can lead to a system hang.
Implication:
Due to this erratum a system hang may occur.
Workaround:
It is possible for the BIOS to contain a workaround for this erratum
Status:
For the steppings affected, see the Summary Tables of Changes.
28
Specification Update
Hide quick links:
Advertisement
Table of Contents
