https://warshaw.urikrait.online/Short notes on latency, links and small self-hosted systems. https://warshaw.urikrait.online/posts/time-zones-in-calendars.htmlhttps://warshaw.urikrait.online/posts/time-zones-in-calendars.htmlSun, 18 Oct 2026 09:00:00 +0000Scheduling across time zones looks like simple arithmetic until a region changes its rules or daylight saving starts on different dates in different places. Storing a meeting as a moment in UTC loses the intent if the organiser's local rules change. https://warshaw.urikrait.online/posts/mtu-briefly.htmlhttps://warshaw.urikrait.online/posts/mtu-briefly.htmlSat, 17 Oct 2026 09:00:00 +0000The maximum transmission unit is the largest packet a link will carry in one piece. When something along the path has a smaller limit and the signal that would tell the sender gets lost, large packets disappear while small ones get through. https://warshaw.urikrait.online/posts/reading-a-traceroute.htmlhttps://warshaw.urikrait.online/posts/reading-a-traceroute.htmlFri, 16 Oct 2026 09:00:00 +0000Traceroute shows each hop on the way to a destination and how long it took to answer. The tempting mistake is to blame the first hop that shows a high number. https://warshaw.urikrait.online/posts/measuring-what-you-actually-feel.htmlhttps://warshaw.urikrait.online/posts/measuring-what-you-actually-feel.htmlTue, 14 Jul 2026 09:00:00 +0000Average throughput is the number everyone quotes and almost nobody experiences. What a person notices sitting in front of a screen is the tail: the ninety-ninth percentile of round-trip time, the stall while a buffer drains, the half second before the first byte. A link can be fast and still feel broken. https://warshaw.urikrait.online/posts/small-machines-fewer-moving-parts.htmlhttps://warshaw.urikrait.online/posts/small-machines-fewer-moving-parts.htmlSat, 02 May 2026 09:00:00 +0000A two-gigabyte virtual machine is enough to run more than people expect, provided the parts are boring. One process per job, plain files for configuration, logs that a human can read without a query language. Complexity is rented, not owned. https://warshaw.urikrait.online/posts/on-keeping-notes-in-public.htmlhttps://warshaw.urikrait.online/posts/on-keeping-notes-in-public.htmlSat, 21 Mar 2026 09:00:00 +0000Anything written for an audience of one gets sloppy. Publishing forces the second pass where the actual reasoning shows up — usually along with the mistake.