PowerPC e500 Core Family Reference Manual, Rev. 1
7-16 Freescale Semiconductor
Performance Monitor
Com:60 Instruction L1 cache reloads from
fetch
Spec Counts reloads due to demand fetch. Typically used to determine
instruction cache miss rate (along with instructions completed)
Com:61 Number of fetches Spec Counts fetches that write at least one instruction to the IQ. (With
instruction fetched (com:4), can used to compute
instructions-per-fetch)
Instruction MMU, Data MMU and L2 MMU Events
Com:62 Instruction MMU TLB4K reloads Spec Counts reloads in the level 1 instruction MMU TLB4K.þA reload in the
level 2 MMU TLB4Kis not counted.
Com:63 Instruction MMU VSP reloads Spec Counts reloads in the level 1 instruction MMU VSP.þA reload in the
level 2 MMU VSP is not counted.
Com:64 Data MMU TLB4K reloads Spec Counts reloads in the level 1 data MMU TLB4K.þA reload in the level
2 MMU TLB4K is not counted.
Com:65 Data MMU VSP reloads Spec Counts reloads in the level 1 data MMU VSP.þA reload in the level 2
MMU VSP is not counted.
Com:66 L2MMU misses Nonspec Counts instruction TLB/data TLB error interrupts
BIU Interface Usage
Com:67 BIU master requests Spec Master transaction starts (assertions of
ts
Com:68 BIU master instruction-side
requests
Spec Master instruction-side assertions of
ts
Com:69 BIU master data-side requests Spec Master data-side assertions of
ts
Com:70 BIU master data-side castout
requests
Spec Includes replacement pushes and snoop pushes, but not DCBF
castouts. (
ts
assertions caused by master data-side
non-program-demand castouts)
Com:71 BIU master retries Spec Transactions initiated by this processor that were retried on the BIU
interface. (The e500 is master and another device retries the e500
transaction.)
Snoop
Com:72 Snoop requests N/A Externally generated snoop requests. (Counts snoop TSs.)
Com:73 Snoop hits N/A Snoop hits on all data-side resources regardless of the cache state
(modified or exclusive)
Com:74 Snoop pushes N/A Snoop pushes from all data-side resources. (Counts snoop ARTRYs
and WOPs.)
Com:75 Snoop retries N/A Retried snoop requests. (Counts snoop ARTRYs.) (opposite of com
71—another device drives
artry
).
Threshold Events
C0:76
C1:76
Data line fill buffer load miss cycles Spec Instances when the number of cycles between a load allocation in the
data line fill buffer (entry 0) and write-back to the data L1 cache
exceeds the threshold.
C0:77
C1:77
ILFB fetch miss cycles Spec Instances when the number of cycles between allocation in the ILFB
(entry 0) and write-back to the instruction L1 cache exceeds the
threshold.
Table 7-10. Performance Monitor Event Selection (continued)
Number Event
Spec/
Nonspec
Count Description
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