Re: extremely slow writes to array [now not degraded]

Johannes Truschnigg
2023-11-13T06:55:01Z

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You will need to generate some kind of call stack/graph info to start making
sense of the mess your running kernel gets itself into in the scenario you
described.

I imagine that looking at `perf` (`perf top` in particular; it should suffice
to paste a few instances of its topmost lines when the involved kernel threads
are spinning) would yield some useful data to kick off a potentially
productive debate about what could actually be going on.

On Fedora, I think `sudo dnf install perf` should set up everything you need
to get you going; then, look at `sudo perf top -F 999` for a while, and let
the list know what you see. (You can use your terminal emulator's flow control
features, available via Ctrl+S to enable and Ctrl+Q to disable, to "freeze"
the output to make it easier to copy it into a clipboard buffer.)

--
with best regards:
- Johannes Truschnigg ( johannes@truschnigg.info )

www: https://johannes.truschnigg.info/
phone: +436502133337
xmpp: johannes@truschnigg.info

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