Intel ARCHITECTURE IA-32 Reference Manual page 487

Table B-1 Pentium 4 Processor Performance Metrics (continued)
Metric Description
Writes from the The number of all
Processor write transactions on
the bus that were
allocated in IO
Queue from this
processor (excludes
RFOs). Beware of
granularity issues
with this event. 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.
Reads The number of all
Non-prefetch read transactions
from the (includes RFOs but
Processor excludes prefetches)
on the bus that
originated from this
processor. Beware of
granularity issues
with this event. 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_allocation
IOQ_allocation
B
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).
2. Enable edge
6
filtering in
the CCCR.
1a. ReqA0 ,
ALL_READ , OWN
(CPUID model <
2);
1b. ReqA0,
ALL_READ,
MEM_WB, MEM_WT,
MEM_WP, MEM_WC,
MEM_UC, OWN
(CPUID model >=
2).
2. Enable edge
6
filtering in
the CCCR.
continued
B-33