550
Latency
Performance
Counters
Are
Not
Accurate
Description
Latency
performance
counters
NBPMCx
1
E
2
through
NBPMCx
1
E
7
are
not
accurate
when
L
3
speculative
miss
prefetching
is
enabled
(
D
18
F
2
x
1
B
0[13] = 0
b
,
Extended
Memory
Controller
Configuration
Low
[
SpecPrefDis
]).
Potential
Effect
on
System
Performance
monitoring
software
cannot
accurately
measure
latency
events
.
The
reported
latency
may
greatly
exceed
the
actual
latency
in
some
instances
.
Suggested
Workaround
No
workaround
is
recommended
.
Performance
monitoring
software
may
set
D
18
F
2
x
1
B
0[13] = 1
b
to
collect
accurate
latency
values
.
This
workaround
has
an
impact
to
overall
system
performance
.
Fix
Planned
No
fix
planned
Revision
Guide
for
AMD
Family
15
h
Models
00
h-
0
Fh
Processors
48063
Rev
. 3.18
October
2012
34
Product
Errata