Uncore Manual
Reference Number: 329468-002 143
Uncore Performance Monitoring
Intel® QPI Link Layer Performance Monitoring
2.8.7 QPI LL Box Performance Monitor Event List
The section enumerates performance monitoring events for the QPI LL Box.
CLOCKTICKS
• Title: Number of qfclks
• Category: CFCLK Events
• Event Code: 0x14
• Max. Inc/Cyc:. 1, Register Restrictions: 0-3
• Definition: Counts the number of clocks in the QPI LL. This clock runs at 1/8th the “GT/s” speed
of the QPI link. For example, a 8GT/s link will have qfclk or 1GHz. The prior generation uncore in
Intel Xeon processor E5-2600 Product Family does not support dynamic link speeds, so this fre-
quency is fixed.
CTO_COUNT
• Title: Count of CTO Events
• Category: CTO Events
• Event Code: 0x38
• Extra Select Bit: Y
• Max. Inc/Cyc:. 2, Register Restrictions: 0-3
• Filter Dependency: QPIMask0[17:0],QPIMatch0[17:0],QPIMask1[19:16],QPIMatch1[19:16]
• Definition: Counts the number of CTO (cluster trigger outs) events that were asserted across the
two slots. If both slots trigger in a given cycle, the event will increment by 2. You can use edge
detect to count the number of cases when both events triggered.
NCB_DATA_MSGS_FROM_QPI:
NCB Data Messages From QPI in bytes
(RxL_FLITS_G2.NCB_DATA * 8)
PCT_LINK_CRC_RETRY_CYCLES:
Percent of Cycles the QPI link layer is in
retry mode due to CRC errors
RxL_CRC_CYCLES_IN_LLR / CLOCKTICKS
PCT_LINK_FULL_POWER_CYCLES:
Percent of Cycles the QPI link is at Full
Power
RxL0_POWER_CYCLES / CLOCKTICKS
PCT_LINK_HALF_DISABLED_CYCLES:
Percent of Cycles the QPI link in power
mode where half of the lanes are disabled.
RxL0P_POWER_CYCLES / CLOCKTICKS
PCT_LINK_SHUTDOWN_CYCLES:
Percent of Cycles the QPI link is Shutdown
L1_POWER_CYCLES / CLOCKTICKS
QPI_DATA_BW:
QPI data transmit bandwidth in Bytes
TxL_FLITS_G0.DATA * 8
QPI_LINK_BW:
QPI total transmit bandwidth in Bytes
(includes control)
(TxL_FLITS_G0.DATA + TxL_FLITS_G0.NON_DATA) * 8
QPI_LINK_UTIL:
Percentage of cycles that QPI Link was
utilized. Calculated from 1 - Number of idle
flits - time the link was 'off'
(RxL_FLITS_G0.DATA + RxL_FLITS_G0.NON_DATA) / (2 *
CLOCKTICKS)
QPI_SPEED:
QPI Speed - In GT/s (GigaTransfers /
Second) - Max QPI Bandwidth is 2 * ROUND
(QPI Speed, 0)
ROUND ((CLOCKTICKS / TSC) * TSC_SPEED, 0) * (8 /
1000)
Symbol Name:
Definition
Equation