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This is getting laughably ridiculous
(lemmy.ml)
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this post was submitted on 14 Aug 2025
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Privacy
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I don't know the answer, but I'm interested, what do you use that for?
I believe it has a lot to do with the default amount of dirty memory. dirty memory is mostly the write cache, which is unnecessary to have a lot of, as that does not improve anything after a certain point, but at best it can mislead you to believe that a copy opetation started with 200 MB/s and that it finished when it actually did not yet.
https://web.archive.org/web/20220828115647/https://archived.forum.manjaro.org/t/decrease-dirty-bytes-for-more-reliable-usb-transfer/62513
https://www.kernel.org/doc/html/latest/admin-guide/sysctl/vm.html
you can fix these limits with sysctl files. they are loaded on boot on typical systemd systems. suggestions are in the manjaro post, relevant for any desktop linux system.
maybe it's worth to set these up even if you are good for now. It's good to hear a kernel change could have fixed it though. maybe they have finally revised the defaults, they wanted to do that for a few years now..