Intel ARCHITECTURE IA-32 Reference Manual page 492

IA-32 Intel® Architecture Optimization
Table B-1 Pentium 4 Processor Performance Metrics (continued)
Metric
Bus Writes
Underway from
7
the processor
Bus Accesses
Underway from
7
All Agents
B-38
Description
This is an accrued
sum of the durations
of all write
transactions by this
processor. Divide by
"Writes from the
Processor" to get bus
write 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.
This is an accrued
sum of the durations
of entries by all
agents on the bus.
Divide by "Bus
Accesses from All
Agents" to get bus
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.
Event Name or Metric
Expression
IOQ_active_entries
IOQ_active_entries
Event Mask Value
Required
1a. ReqA0,
ALL_WRITE, OWN
(CPUID model <
2);
1b. ReqA0,
ALL_WRITE,
MEM_WB, MEM_WT,
MEM_WP, MEM_WC,
MEM_UC, OWN
(CPUID model >=
2).
1a. ReqA0,
ALL_READ,
ALL_WRITE, OWN,
OTHER, PREFETCH
(CPUID model <
2); 1b.ReqA0,
ALL_READ,
ALL_WRITE,
MEM_WB, MEM_WT,
MEM_WP, MEM_WC,
MEM_UC, OWN,
OTHER, PREFETCH
(CPUID model >=
2).
continued