19-206 Vol. 3B
PERFORMANCE-MONITORING EVENTS
The count includes only L2 cacheable
instruction fetches; it does not include UC
instruction fetches.
It does not include ITLB miss accesses.
29H
L2_LD
MESI
0FH
Number of L2 data loads.
This event indicates that a normal, unlocked,
load memory access was received by the L2.
It includes only L2 cacheable memory
accesses; it does not include I/O accesses,
other nonmemory accesses, or memory
accesses such as UC/WT memory accesses.
It does include L2 cacheable TLB miss
memory accesses.
2AH
L2_ST
MESI
0FH
Number of L2 data stores.
This event indicates that a normal, unlocked,
store memory access was received by the
L2.
it indicates that the DCU sent a read-for-
ownership request to the L2. It also includes
Invalid to Modified requests sent by the DCU
to the L2.
It includes only L2 cacheable memory
accesses; it does not include I/O accesses,
other nonmemory accesses, or memory
accesses such as UC/WT memory accesses.
It includes TLB miss memory accesses.
24H
L2_LINES_IN
00H
Number of lines allocated in the L2.
26H
L2_LINES_OUT
00H
Number of lines removed from the L2 for
any reason.
25H
L2_M_LINES_INM 00H
Number of modified lines allocated in the L2.
27H
L2_M_LINES_
OUTM
00H
Number of modified lines removed from the
L2 for any reason.
2EH
L2_RQSTS
MESI
0FH
Total number of L2 requests.
21H
L2_ADS
00H
Number of L2 address strobes.
22H
L2_DBUS_BUSY
00H
Number of cycles during which the L2 cache
data bus was busy.
23H
L2_DBUS_BUSY_
RD
00H
Number of cycles during which the data bus
was busy transferring read data from L2 to
the processor.
External
Bus Logic
(EBL)
2
62H
BUS_DRDY_
CLOCKS
00H
(Self)
20H
(Any)
Number of clocks during which DRDY# is
asserted.
Utilization of the external system data bus
during data transfers.
Unit Mask = 00H counts bus clocks
when the processor is driving
DRDY#.
Unit Mask = 20H counts in
processor clocks when any agent is
driving DRDY#.
Table 19-37. Events That Can Be Counted with the P6 Family Performance-Monitoring Counters (Contd.)
Unit
Event
Num.
Mnemonic Event
Name
Unit
Mask Description
Comments