Table of Contents
A fine-grained view of high-performance networking
What this talk is about
What this talk is not about
State of the net
Going from four 9’s to five 9’s
Jitter Measurement
20?s accuracy timestamping
Offline Jitter Analysis
99.99% clean
99.99% clean
Better ARP implemention
Packets with “negative” delay?
Jitter shift due to rerouting
Constant baseline sawtooth
Mostly smooth, except...
A very large delay
Rare but significant events
Outage followed by flood
Severe jitter and misordering
Transmit view: “blender event”
Data rate of blender event
Slope shows deceleration
Slope shows deceleration
Monitor routing along with jitter
A recent “micro-blender”
Routing loops cause blenders
Why do loops happen?
Excess churn on lifetime 0 LSPs
Long LSP propagation times
Explanation
Routing loop on another path?
A recent week (very boring)
Experiment conclusions
|