Ping Loss Quality
Want quick to grasp indicator of link quality
Loss is the most sensitive indicator
- loss of packet requires ~ 4 sec TCP retry timeout
- Studies on economic value of response time by IBM showed there is a threshold around 4-5secs where complaints increase.
- 0-1% = Good 1-2.5% = Acceptable
- 2.5%-5% = Poor 5%-12% = Very Poor
- > 12% = Bad
Notes:
The scarcest and most valuable commodity is time. Studies in late 70’s and early 80s by Walt Doherty of IBM and others showed the economic value of Rapid Response Time:
High productivity interactive response
Sporadically interactive regime
There is a threshold around 4-5s where complaints increase rapidly. For some newer Internet applications there are other thresholds, for example for voice a threshold appears at about 100ms - above that point, the delay causes difficulty for people trying to have a conversation and frustration grows.