Intel ARCHITECTURE IA-32 Reference Manual page 497

Table B-1 Pentium 4 Processor Performance Metrics (continued)
Metric Description
Write WC Partial This is an accrued
Underway sum of the durations
8
(BSQ) of partial write
transactions to
WC-type memory.
Divide by Write WC
Partial (BSQ) to
estimate average
request latency. User
note: Allocated
entries of WC
partials that originate
from DWord
operands are not
included.
Characterization Metrics
x87 Input The number of
Assists occurrences of x87
input operands
needing assistance
to handle an
exception condition.
This stat is often
used in a
per-instruction ratio.
x87 Output The number of
Assists occurrences of x87
operations needing
assistance to handle
an exception
condition.
Using Performance Monitoring Events
Event Name or Metric
Expression
BSQ_active_entries
X87_assists
X87_assists
B
Event Mask Value
Required
1. REQ_TYPE1|
REQ_LEN0|
MEM_TYPE0|
REQ_DEM_TYPE
2. Enable edge
6
filtering in
the CCCR.
PREA
POAO, POAU
continued
B-43