timestamps.lua

--- This script can be used to measure timestamping precision and accuracy.
--  Connect cables of different length between two ports (or a fiber loopback cable on a single port) to use this.
local dpdk      = require "dpdk"
local ts        = require "timestamping"
local device    = require "device"
local hist      = require "histogram"

function master(txPort, rxPort)
    if not txPort or not rxPort then
        errorf("usage: txPort rxPort")
    end
    local txDev = device.config(txPort)
    local rxDev = device.config(rxPort)
    device.waitForLinks()
    runTest(txDev:getTxQueue(0), rxDev:getRxQueue(0))
end

function runTest(txQueue, rxQueue)
    local timestamper = ts:newTimestamper(txQueue, rxQueue)
    local hist = hist:new()
    while dpdk.running() do
        hist:update(timestamper:measureLatency())
    end
    hist:save("histogram.csv")
    hist:print()
end