Post #4141970
2026-07-27 15:39 UTC
If you ask about any performance problem online, as in "Why is my disk/network/filesystem so slow?" In 9/10 posts, you'd be told that "You must enable/use Y for high performance." or "Your system is slow because your hardware really is that slow." Sometimes from veteran sysadmins. Often these answers are completely wrong. There's actually a hidden slow-path or config knob somewhere - but sometimes it needs 10 fresh OS reinstalls and a kernel profiler to find it, so most problems are never solved.
Replies (2)
-
@niconiconi@mk.absturztau.be 2026-07-27 15:52
I only get 4 Gbps from my 10 Gbps server, I'll never ask "why" online, because I'm 100% guaranteed to get the silly answer of "enable Jumbo Frame". 10 GbE servers worked over Internet for a decade with no jumbo frames. Actually solving it requires testing a bunch of hypervisor, guest, routing, bridge, netfilters combinations to find the PPS bottleneck (conveniently worked around by jumbo frames).
-
@argv_minus_one@mastodon.sdf.org 2026-07-27 15:43
@niconiconi@mk.absturztau.be From personal experience, sometimes it's a pinched SATA cable.