LOG/041
Latency is a shape, not a number
A single average hides the interesting part. Looking at variation over time often explains behaviour that a headline metric cannot.
PACKETJOURNAL
Notebook / PJ-04
Short technical notes about networks, protocols, failure modes and the useful details discovered while building small systems.
FORMAT
Plain text / diagrams
SUBJECT
Networks & systems
STATUS
Ongoing notebook
01 / Recent logs
Notes from the bench
LOG/040
Small failure domains
Systems become easier to reason about when one broken component has a clearly limited effect on everything around it.
LOG/039
Reading the path backwards
When a connection behaves unexpectedly, tracing each boundary in reverse can be more useful than staring at the endpoint.
LOG/038
Defaults are architecture
Quiet defaults accumulate into system behaviour. Writing them down is often the first step toward understanding the whole.
02 / Sketch
INPUT
observe
→
MODEL
reduce
→
OUTPUT
verify
03 / Margin
The useful question is rarely “does it work?” but “how does it fail?”