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Using Performance Monitoring Events B
B-37
All UC
Underway from
the processor
7
This is an accrued
sum of the durations
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.
IOQ_active_entries 1a. ReqA0,
MEM_UC, OWN
(CPUID model <
2);
1a.
ReqA0,ALL_READ,
ALL_WRITE,
MEM_UC, OWN
(CPUID model >=
2)
All WC
Underway from
the processor
7
This is an accrued
sum of the durations
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.
IOQ_active_entries 1a. ReqA0,
MEM_WC, OWN
(CPUID model <
2);
1a.
ReqA0,ALL_READ,
ALL_WRITE,
MEM_WC, OWN
(CPUID model >=
2)
continued
Table B-1 Pentium 4 Processor Performance Metrics (continued)
Metric Description
Event Name or Metric
Expression
Event Mask Value
Required