Uncore Manual

Uncore Performance Monitoring
Intel® QPI Link Layer Performance Monitoring
144 Reference Number: 329468-002
DIRECT2CORE
• Title: Direct 2 Core Spawning
• Category: DIRECT2CORE Events
• Event Code: 0x13
• Max. Inc/Cyc:. 1, Register Restrictions: 0-3
• Definition: Counts the number of DRS packets that we attempted to do direct2core on. There are
4 mutually exclusive filters. Filter [0] can be used to get successful spawns, while [1:3] provide the
different failure cases. Note that this does not count packets that are not candidates for
Direct2Core. The only candidates for Direct2Core are DRS packets destined for Cbos.
L1_POWER_CYCLES
• Title: Cycles in L1
• Category: POWER Events
• Event Code: 0x12
• Max. Inc/Cyc:. 1, Register Restrictions: 0-3
• Definition: Number of QPI qfclk cycles spent in L1 power mode. L1 is a mode that totally shuts
down a QPI link. Use edge detect to count the number of instances when the QPI link entered L1.
Link power states are per link and per direction, so for example the Tx direction could be in one
state while Rx was in another. Because L1 totally shuts down the link, it takes a good amount of
time to exit this mode.
Table 2-139. Unit Masks for DIRECT2CORE
Extension
umask
[15:8]
Description
SUCCESS_RBT_HIT bxxxxxxx1 Spawn Success
The spawn was successful. There were sufficient credits, the RBT
valid bit was set and there was an RBT tag match. The message was
marked to spawn direct2core.
FAILURE_CREDITS bxxxxxx1x Spawn Failure - Egress Credits
The spawn failed because there were not enough Egress credits. Had
there been enough credits, the spawn would have worked as the RBT
bit was set and the RBT tag matched.
FAILURE_RBT_HIT bxxxxx1xx Spawn Failure - RBT Invalid
The spawn failed because the route-back table (RBT) specified that
the transaction should not trigger a direct2core transaction. This is
common for IO transactions. There were enough Egress credits and
the RBT tag matched but the valid bit was not set.
FAILURE_CREDITS_RBT bxxxx1xxx Spawn Failure - Egress and RBT Invalid
The spawn failed because there were not enough Egress credits AND
the RBT bit was not set, but the RBT tag matched.
FAILURE_MISS bxxx1xxxx Spawn Failure - RBT Miss
The spawn failed because the RBT tag did not match although the
valid bit was set and there were enough Egress credits.
FAILURE_CREDITS_MISS bxx1xxxxx Spawn Failure - Egress and RBT Miss
The spawn failed because the RBT tag did not match and there
weren't enough Egress credits. The valid bit was set.
FAILURE_RBT_MISS bx1xxxxxx Spawn Failure - RBT Miss and Invalid
The spawn failed because the RBT tag did not match and the valid bit
was not set although there were enough Egress credits.
FAILURE_CREDITS_RBT_
MISS
b1xxxxxxx Spawn Failure - Egress and RBT Miss, Invalid
The spawn failed because the RBT tag did not match, the valid bit
was not set and there weren't enough Egress credits.