Two shuttles connected end to end with an ethernet cable and synchronized with PTP emit signals, and a logic analyzer measures variation in those signals, similar to "Shuttle controlled A20 signal output jitter" measures
Two shuttles connected end to end with an ethernet cable and synchronized with PTP emit signals, and a logic analyzer measures variation in those signals, similar to "Shuttle controlled A20 signal output jitter" measures
**Common test metadata:** Device: Shuttle, Linux kernel version: 4.19, Task priority: 98, Interval: 10000us, Boot Parameters: isolcpus,rcu_nocbs,irqaffinity, ETF qdisc delta: None, Device and processor load: None, Test duration: 0h10, Speed (Mb/s): 1000, ETF offset: 500us, Packet route: E2E, qdisc: pfifo_fast, Client device: A20, XDP: no
**Common test metadata:** Device: Shuttle, Linux kernel version: 4.19, Task priority: 98, Interval: 10000us, Boot Parameters: isolcpus,rcu_nocbs,irqaffinity, ETF qdisc delta: None, Device and processor load: None, Test duration: 0h10, Speed (Mb/s): 1000, ETF offset: 500us, Packet route: E2E, qdisc: pfifo_fast, Client device: A20, XDP: no, Callback delay: none
Minimum | Maximum | Average | Standard deviation | Lost packets
Minimum | Maximum | Average | Standard deviation | Lost packets
An UDP packet is periodically sent from one board to another using a real time thread. The receiving board calculates the intervals between the packets it receives, and sees how much it differs from the scheduled interval.
An UDP packet is periodically sent from one board to another using a real time thread. The receiving board calculates the intervals between the packets it receives, and sees how much it differs from the scheduled interval.
@@ -87,12 +88,14 @@ Minimum | Maximum | Average | Standard deviation | Lost packets
...
@@ -87,12 +88,14 @@ Minimum | Maximum | Average | Standard deviation | Lost packets
Two A20 boards are connected end to end with an ethernet cable to a shuttle. All devices are synchronized with PTP. The shuttle sends packets containing timestamps to the boards, and the boards emit a signal at the given timestamp. A logic analyzer measures the variation difference between the signals of the two boards.
Two A20 boards are connected end to end with an ethernet cable to a shuttle. All devices are synchronized with PTP. The shuttle sends packets containing timestamps to the boards, and the boards emit a signal at the given timestamp. A logic analyzer measures the variation difference between the signals of the two boards.
**Common test metadata:** Device: A20, Linux kernel version: 5.6, Task priority: 98, Interval: 1000us, Boot Parameters: isolcpus,rcu_nocbs,irqaffinity, ETF qdisc delta: None, Device and processor load: None, Test duration: 0h20, Speed (Mb/s): 1000, ETF offset: 500us, Packet route: E2E, qdisc: pfifo_fast, Client device: Shuttle, XDP: no
**Common test metadata:** Device: A20, Linux kernel version: 5.6, Task priority: 98, Boot Parameters: isolcpus,rcu_nocbs,irqaffinity, ETF qdisc delta: None, Device and processor load: None, Speed (Mb/s): 1000, ETF offset: 500us, Packet route: E2E, qdisc: pfifo_fast, XDP: no
Minimum | Maximum | Average | Standard deviation | Lost packets
Metadata | Minimum | Maximum | Average | Standard deviation | Lost packets
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{"measure_sets":[{"measure_type":"shuttle_signal_jitter","props_names":["Shuttle signal output jitter"],"units":["us"],"middle":0,"props":[[296,321,309,295,311,304,285,291,301,284,307,300,283,294,299,275,269,293,297,282,276,325,281,298,296,273,292,268,297,256,271,310,287,285,302,277,272,283,270,260,271,276,270,280,279,269,275,275,278,282,277,246,273,279,257,251,252,261,275,279,261,244,252,256,260,271,254,258,245,247,255,235,222,235,270,227,229,228,231,224,225,225,207,225,210,211,196,214,206,195,186,219,199,194,202,192,177,201,171,175,181,173,180,177,169,169,160,172,177,149,172,162,153,153,146,153,162,158,148,143,151,143,120,124,141,131,129,131,120,131,132,132,99,134,135,104,110,119,107,112,130,107,96,106,114,101,111,112,100,107,110,101,95,110,102,105,106,102,105,118,120,93,108,100,110,114,111,114,119,106,106,103,125,129,115,130,137,126,117,139,136,118,147,135,128,149,150,149,151,151,151,144,162,156,153,153,159,155,144,162,180,154,191,167,177,179,172,171,180,189,160,177,183,196,183,193,190,198,198,197,195,178,189,208,190,208,211,206,198,180,192,199,211,212,197,223,221,210,203,205,224,207,200,215,216,222,224,228,217,225,205,215,206,219,209,203,210,193,201,218,202,181,199,191,196,198,174,181,170,190,186,175,162,167,171,153,163,154,157,145,154,148,145,142,142,159,138,131,141,133,126,122,133,118,122,123,111,112,123,97,94,101,111,106,97,108,95,88,93,92,74,85,91,68,93,79,71,68,70,64,61,64,61,56,54,56,53,45,54,42,40,45,41,29,42,27,31,18,23,20,24,26,22,19,13,16,9,18,8,10,17,10,8,4,7,4,1,2,4,1,6,4,2,1,0,1,0,0,2,0,0,1,0,0,1]],"props_type":"histogram","metadata":{"dev":"Shuttle","ker":"4.19","prio":"98","i":"10000us","boot_p":"isolcpus,rcu_nocbs,irqaffinity","delta":"None","load":"None","duration":"0h10","speed":"1000","etf_offset":"500us","route":"E2E","qdisc":"pfifo_fast","client":"A20","XDP":"no","delay":"none","lost_packets":"0"}}]}
Description: Uses cyclictest from the rt-tests test suite to measure wake-up latency. A real-time thread is run on CPU1, and wakes up at a regular interval (specified by the interval parameter) using clock_nanosleep. It then uses clock_gettime and computes the difference between the scheduled wake-up time and the effective wake-up time measured by clock_gettime.
Description: Uses cyclictest from the rt-tests test suite to measure wake-up latency. A real-time thread is run on CPU1, and wakes up at a regular interval (specified by the interval parameter) using clock_nanosleep. It then uses clock_gettime and computes the difference between the scheduled wake-up time and the effective wake-up time measured by clock_gettime.
The command used is: cyclictest -p `prio` -a1 -t1 -n -h 200 -q -i `interval`
The command used is: cyclictest -p `prio` -a1 -t1 -n -h 200 -q -i `interval`
##packet_jitter
##packet_jitter
Ignored metadata:
Ignored metadata: delay
Description: An UDP packet is periodically sent from one board to another using a real time thread. The receiving board calculates the intervals between the packets it receives, and sees how much it differs from the scheduled interval.
Description: An UDP packet is periodically sent from one board to another using a real time thread. The receiving board calculates the intervals between the packets it receives, and sees how much it differs from the scheduled interval.
##packet_rx_timestamps
##packet_rx_timestamps
Ignored metadata:
Ignored metadata: delay
Description: An UDP packet is periodically sent from one board to another using a real time thread. The receiving board uses the SO_TIMESTAMPING option to see when the packet entered the kernel, and generates timestamps with clock_gettime once the packets enters userspace to compute the time the packet spent in kernel space.
Description: An UDP packet is periodically sent from one board to another using a real time thread. The receiving board uses the SO_TIMESTAMPING option to see when the packet entered the kernel, and generates timestamps with clock_gettime once the packets enters userspace to compute the time the packet spent in kernel space.
##packet_tx_timestamps
##packet_tx_timestamps
Ignored metadata:
Ignored metadata: delay
Description: Similar to packet_rx_timestamps, but on the transmitting board.
Description: Similar to packet_rx_timestamps, but on the transmitting board.
##packet_rtt
##packet_rtt
Ignored metadata:
Ignored metadata: delay
Description: A UDP packet is periodically sent from one board to another and sent back as soon as it arrives using a real time thread. The round trip time is computed with clock_gettime on the transmitting board.
Description: A UDP packet is periodically sent from one board to another and sent back as soon as it arrives using a real time thread. The round trip time is computed with clock_gettime on the transmitting board.
##shuttle_a20_signal_jitter
##shuttle_a20_signal_jitter
Ignored metadata:
Ignored metadata: dev,client
Description: Two A20 boards are connected end to end with an ethernet cable to a shuttle. All devices are synchronized with PTP. The shuttle sends packets containing timestamps to the boards, and the boards emit a signal at the given timestamp. A logic analyzer measures the variation difference between the signals of the two boards.
Description: Two A20 boards are connected end to end with an ethernet cable to a shuttle. All devices are synchronized with PTP. The shuttle sends packets containing timestamps to the boards, and the boards emit a signal at the given timestamp. A logic analyzer measures the variation difference between the signals of the two boards.
##shuttle_signal_jitter
##shuttle_signal_jitter
Ignored metadata:
Ignored metadata: delay
Description: Two shuttles connected end to end with an ethernet cable and synchronized with PTP emit signals, and a logic analyzer measures variation in those signals, similar to "Shuttle controlled A20 signal output jitter" measures
Description: Two shuttles connected end to end with an ethernet cable and synchronized with PTP emit signals, and a logic analyzer measures variation in those signals, similar to "Shuttle controlled A20 signal output jitter" measures
##ping_interval
##ping_interval
Ignored metadata: delta,qdisc,etf_offset
Ignored metadata: delta,qdisc,etf_offset,delay
Description: Ping RTT from A20 to shuttle, with fixed interval
Description: Ping RTT from A20 to shuttle, with fixed interval