Intel ARCHITECTURE IA-32 Reference Manual page 496

IA-32 Intel® Architecture Optimization
Table B-1 Pentium 4 Processor Performance Metrics (continued)
Metric
WB Writes Full
Underway
8
(BSQ)
UC Reads
Chunk
Underway
8
(BSQ)
B-42
Description
This is an accrued
sum of the durations
of writeback (evicted
from cache)
transactions to
WB-type memory.
Divide by Writes WB
Full (BSQ) to
estimate average
request latency. User
note: Beware of
effects of writebacks
from 2nd-level cache
that are quickly
satisfied from the
3rd-level cache (if
present).
This is an accrued
sum of the durations
of UC read
transactions. Divide
by UC Reads Chunk
(BSQ) to estimate
average request
latency. User note:
Estimated latency
may be affected by
undercount in
allocated entries.
Event Name or Metric
Expression
BSQ_active_entries
BSQ_active_entries
Event Mask Value
Required
1. REQ_TYPE0|
REQ_TYPE1|
REQ_LEN0|
REQ_LEN1|
MEM_TYPE1|
MEM_TYPE2|
REQ_CACHE_TYPE|
REQ_DEM_TYPE
1. REQ_LEN0|
REQ_ORD_TYPE|
REQ_DEM_TYPE
2. Enable edge
6
filtering in
the CCCR.
continued