Intel ARCHITECTURE IA-32 Reference Manual page 491

Table B-1 Pentium 4 Processor Performance Metrics (continued)
Metric Description
All UC This is an accrued
Underway from sum of the durations
7
the processor of all UC transactions
by this processor.
Divide by "All UC
from the processor"
to get UC request
latency. Also Beware
of different recipes in
mask bits for
Pentium 4 and Intel
Xeon processors
between CPUID
model field value of 2
and model value less
than 2.
All WC This is an accrued
Underway from sum of the durations
7
the processor of all WC
transactions by this
processor. Divide by
"All WC from the
processor" to get WC
request latency. Also
Beware of different
recipes in mask bits
for Pentium 4 and
Intel Xeon
processors between
CPUID model field
value of 2 and model
value less than 2.
Using Performance Monitoring Events
Event Name or Metric
Expression
IOQ_active_entries
IOQ_active_entries
B
Event Mask Value
Required
1a. ReqA0,
MEM_UC, OWN
(CPUID model <
2);
1a.
ReqA0,ALL_READ,
ALL_WRITE,
MEM_UC, OWN
(CPUID model >=
2)
1a. ReqA0,
MEM_WC, OWN
(CPUID model <
2);
1a.
ReqA0,ALL_READ,
ALL_WRITE,
MEM_WC, OWN
(CPUID model >=
2)
continued
B-37