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Measuring Page Load Speed with Navigation Timing describes the standard instrumentation built into web browsers. This article will use navigation timing as an example to demonstrate how
custom sFlow events augment standard sFlow instrumentation embedded in network devices, load balancers, hosts and web servers.
The
JQuery script can be embedded in a web page to provide timing information:
$(window).load(function(){
var samplingRate = 10;
if(samplingRate !== 1 && Math.random() > (1/samplingRate)) return;
setTimeout(function(){
if(window.performance) {
var t = window.performance.timing;
var msg = {
sampling_rate : samplingRate,
t_url : {type:"string",value:window.location.href},
t_useragent : {type:"string",value:navigator.userAgent},
t_loadtime : {type:"int32",value:t.loadEventEnd-t.navigationStart},
t_connecttime : {type:"int32",value:t.responseEnd-t.requestStart}
};
$.ajax({
url:"/navtiming.php",
method:"PUT",
contentType:"application/json",
data:JSON.stringify(msg)
});
}
}, 0);
});The script supports random sampling. In this case a samplingRate of 10 means that, on average, 1-in-10 page hits will generate a measurement record. Measurement records are sent back to the server where the navtiming.php script acts as a gateway, augmenting the measurements and sending them as custom sFlow events.
<?php
$rawInput = file_get_contents("php://input");
$rec = json_decode($rawInput);
$rec->datasource = "navtime";
$rec->t_ip = array("type" => "ip", "value" => $_SERVER['REMOTE_ADDR']);
$msg=array("rtflow"=>$rec);
$sock = fsockopen("udp://localhost",36343,$errno,$errstr);
if(! $sock) { Continue reading
Ericsson wins network management deal with Swisscom; Nokia signs 5-year contract with Wind Mobile.
Riverbed gets an NFV win out of it, too.