Hello,
I have a problem with the high of the calculated path delay. I am using hardware timestamping and thought I get values less than 20ns. But i have values over 7.8µs is that normal?
I have also tested the usecase with an i210, there I got 250ns, but these are also quite high.
I have also tested the usecase with an i210, there I got 250ns, but these are also quite high.
Questions:
1. why are the values of i219 and i210 so different? what does the path delay depend on?
2. if it depends only on the NIC, where can I find out which NIC is the best one for hardware time stamping, which keywords in the datasheet are important?
3. Is there a driver problem or is it possible to change something at the ptp-files to get better values?
2. if it depends only on the NIC, where can I find out which NIC is the best one for hardware time stamping, which keywords in the datasheet are important?
3. Is there a driver problem or is it possible to change something at the ptp-files to get better values?
NIC: I2019-V rev 21
driver: e1000e - 3.8.4-NAPI
driver: e1000e - 3.8.4-NAPI
Kernel:5.4.0-104-generic
output of: ethtool -T enp0s31f6:
Time stamping parameters for enp0s31f6:
Capabilities:
hardware-transmit (SOF_TIMESTAMPING_TX_HARDWARE)
software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE)
hardware-receive (SOF_TIMESTAMPING_RX_HARDWARE)
software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)
software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
hardware-raw-clock (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
off (HWTSTAMP_TX_OFF)
on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
none (HWTSTAMP_FILTER_NONE)
all (HWTSTAMP_FILTER_ALL)
ptpv1-l4-sync (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)
ptpv1-l4-delay-req (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)
ptpv2-l4-sync (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)
ptpv2-l4-delay-req (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)
ptpv2-l2-sync (HWTSTAMP_FILTER_PTP_V2_L2_SYNC)
ptpv2-l2-delay-req (HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ)
ptpv2-event (HWTSTAMP_FILTER_PTP_V2_EVENT)
ptpv2-sync (HWTSTAMP_FILTER_PTP_V2_SYNC)
ptpv2-delay-req (HWTSTAMP_FILTER_PTP_V2_DELAY_REQ)
Time stamping parameters for enp0s31f6:
Capabilities:
hardware-transmit (SOF_TIMESTAMPING_TX_HARDWARE)
software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE)
hardware-receive (SOF_TIMESTAMPING_RX_HARDWARE)
software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)
software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
hardware-raw-clock (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
off (HWTSTAMP_TX_OFF)
on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
none (HWTSTAMP_FILTER_NONE)
all (HWTSTAMP_FILTER_ALL)
ptpv1-l4-sync (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)
ptpv1-l4-delay-req (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)
ptpv2-l4-sync (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)
ptpv2-l4-delay-req (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)
ptpv2-l2-sync (HWTSTAMP_FILTER_PTP_V2_L2_SYNC)
ptpv2-l2-delay-req (HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ)
ptpv2-event (HWTSTAMP_FILTER_PTP_V2_EVENT)
ptpv2-sync (HWTSTAMP_FILTER_PTP_V2_SYNC)
ptpv2-delay-req (HWTSTAMP_FILTER_PTP_V2_DELAY_REQ)
I use a i219-Notebook with following command as a slave: sudo ptp4l -P -H -l 7 -i enp0s31f6 -m -s
The "Master"-command is simmiliar just with another interface and without -s.
Output:
ptp4l[183917.707]: selected best master clock 70ff76.fffe.1dea84
ptp4l[183917.707]: port 1 (enp0s31f6): LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l[183918.444]: port 1 (enp0s31f6): delay timeout
ptp4l[183918.445]: delay filtered 7358 raw 7319
ptp4l[183918.707]: master offset 239333 s0 freq +45884 path delay 7858
ptp4l[183919.444]: port 1 (enp0s31f6): delay timeout
ptp4l[183919.445]: delay filtered 7358 raw 7422
ptp4l[183919.707]: master offset 239368 s1 freq +45919 path delay 7858
ptp4l[183920.444]: port 1 (enp0s31f6): delay timeout
ptp4l[183920.445]: delay filtered 7349 raw 7345
ptp4l[183920.708]: master offset -464 s2 freq +45455 path delay 7849
ptp4l[183920.708]: port 1 (enp0s31f6): UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l[183921.445]: port 1 (enp0s31f6): delay timeout
ptp4l[183921.445]: delay filtered 7349 raw 7336
ptp4l[183921.709]: master offset -485 s2 freq +45295 path delay 7849
ptp4l[183922.445]: port 1 (enp0s31f6): delay timeout
ptp4l[183922.446]: delay filtered 7349 raw 7365
ptp4l[183922.709]: master offset 27 s2 freq +45661 path delay 7849
ptp4l[183923.445]: port 1 (enp0s31f6): delay timeout
ptp4l[183923.446]: delay filtered 7340 raw 7330
ptp4l[183923.709]: master offset 137 s2 freq +45779 path delay 7840
ptp4l[183917.707]: selected best master clock 70ff76.fffe.1dea84
ptp4l[183917.707]: port 1 (enp0s31f6): LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l[183918.444]: port 1 (enp0s31f6): delay timeout
ptp4l[183918.445]: delay filtered 7358 raw 7319
ptp4l[183918.707]: master offset 239333 s0 freq +45884 path delay 7858
ptp4l[183919.444]: port 1 (enp0s31f6): delay timeout
ptp4l[183919.445]: delay filtered 7358 raw 7422
ptp4l[183919.707]: master offset 239368 s1 freq +45919 path delay 7858
ptp4l[183920.444]: port 1 (enp0s31f6): delay timeout
ptp4l[183920.445]: delay filtered 7349 raw 7345
ptp4l[183920.708]: master offset -464 s2 freq +45455 path delay 7849
ptp4l[183920.708]: port 1 (enp0s31f6): UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l[183921.445]: port 1 (enp0s31f6): delay timeout
ptp4l[183921.445]: delay filtered 7349 raw 7336
ptp4l[183921.709]: master offset -485 s2 freq +45295 path delay 7849
ptp4l[183922.445]: port 1 (enp0s31f6): delay timeout
ptp4l[183922.446]: delay filtered 7349 raw 7365
ptp4l[183922.709]: master offset 27 s2 freq +45661 path delay 7849
ptp4l[183923.445]: port 1 (enp0s31f6): delay timeout
ptp4l[183923.446]: delay filtered 7340 raw 7330
ptp4l[183923.709]: master offset 137 s2 freq +45779 path delay 7840
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