README

Build infrastructure
--------------------
0) Install the following packages
a) libpopt-dev
b) libxml2-dev

1) Build external libraries
# make setup PLAT=t96/t83/x86 #For respective platform

2) Build the sepecific application 
# make


How to run
----------

a) Start the lttng

cd external-lib/bin/
sudo ./lttng create --snapshot -o /tmp/debugrt
sudo ./lttng enable-channel -u dpdk  --subbuf-size 16M --num-subbuf 4
sudo ./lttng enable-event --userspace dpdk:zero_arg -c dpdk
sudo ./lttng start

b) Start the test application

example:
LD_PRELOAD=$PWD/external-lib/lib/liblttng-ust.so.0 ./calibrate/build/app/calibrate -c 0x300


example output:

ZERO_ARG is the lttng trace overhead for a "trace entry with void arg" with dpdk plugn for get_cpu and get_clock.

[lttng-overhead-x86] $ sudo LD_PRELOAD=/export/lttng-overhead-x86/external-lib/lib/liblttng-ust.so.0 ./calibrate/build/app/calibrate -c 0xc0
make[1]: Entering directory '/export/lttng-overhead-x86/calibrate'
make[1]: Leaving directory '/export/lttng-overhead-x86/calibrate'
EAL: Detected 56 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Multi-process socket /var/run/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'PA'
EAL: Probing VFIO support...
EAL: PCI device 0000:01:00.0 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
EAL: PCI device 0000:01:00.1 on NUMA socket 0
EAL:   probe driver: 8086:1521 net_e1000_igb
CPU Timer freq is 2600.000000MHz
NOP: cycles=0.194834 ns=0.074936
GET_CLOCK: cycles=47.854658 ns=18.405638
GET_CPU: cycles=30.995892 ns=11.921497
ZERO_ARG: cycles=236.945113 ns=91.132736