A unit that starts fine when you type systemctl start and dies after a reboot has one of four causes, and each has a different fix. The efficient way to…

The standard advice for MySQL on a small VPS is “set innodb_buffer_pool_size to 50–70% of RAM”. On a 1 GB instance that rule produces a 700 MB buffer pool, leaves roughly 60 MB…

nftables sets are the single biggest performance lever most firewall configurations never touch. A ruleset with 400 individual ip saddr matches evaluates linearly; the same 400 addresses placed in a…

An NVMe drive fails in a predictable sequence: endurance is consumed, spare blocks are reallocated, the media error rate climbs, and only then does write latency spike and the device…

Two kernel features get recommended together in almost every high-throughput tuning guide: transparent hugepages for the page tables, and io_uring for the syscall path. They solve different problems — one…

“NVMe-backed storage” is a marketing line on nearly every VPS product page. Whether the storage on your specific instance actually delivers NVMe-class throughput is something you can measure in about…

Nginx is famous for handling enormous concurrency on modest hardware, but the defaults are conservative and the tuning advice online is mostly copy-pasted folklore. The real limits are arithmetic, not…

Packet loss that shows up only as slow application performance is one of the hardest faults to localise, because the loss may occur on your instance, in the provider’s fabric,…

You can tune TCP congestion control all day and still see latency spiral during a backup or a large upload, because the culprit is not the congestion-control algorithm — it…

On a WAN link with 100 ms or more of round-trip delay, a small VPS running the default CUBIC congestion control spends most of its time growing its window slowly…