this post was submitted on 06 Jan 2026
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Dealing with faulty RAM modules in 2026 (blog.kumio.org)
submitted 6 days ago by kumi@feddit.online to c/linux@programming.dev
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How to test and safely keep using your janky RAM without compromising stability using memtest86+ and the memmap kernel param.

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[โ€“] kumi@feddit.online 3 points 5 days ago* (last edited 5 days ago)

Thank you, I'm glad you like!

not having worked with memmap before, it is not immediately obvious to me which hex means what (I am guessing RANGE@START? ). Would be nice to have a link to an explanation there.

I just have the link to the kernel docs because I think they do a better job explaining it than I would ๐Ÿ˜

But yeah, basically. Except for this use-case you want RANGE$START not @. And you can use human sizes like 128M$RANGE.