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IA-32 Intel® Architecture Optimization
B-24
Trace Cache
Misses
The number of times
that significant
delays occurred in
order to decode
instructions and build
a trace because of a
TC miss.
BPU_fetch_request TCMISS
TC to ROM
Transfers
Twice the number of
times that the ROM
microcode is
accessed to decode
complex IA-32
instructions instead
of building|delivering
traces. (Divide the
count by 2 to get the
number of
occurrence.)
tc_ms_xfer CISC
Speculative
TC-Built Uops
The number of
speculative uops
originating when the
TC is in build mode.
uop_queue_writes FROM_TC_BUILD
Speculative
TC-Delivered
Uops
The number of
speculative uops
originating when the
TC is in deliver
mode.
uop_queue_writes FROM_TC_DELIVER
Speculative
Microcode
Uops
The number of
speculative uops
originating from the
microcode ROM (Not
all uops of an
instruction from the
microcode ROM will
be included).
uop_queue_writes FROM_ROM
continued
Table B-1 Pentium 4 Processor Performance Metrics (continued)
Metric Description
Event Name or Metric
Expression
Event Mask Value
Required