more random thought: I've had issues with bad RAM two times in my life. it takes me some time to get from "huh, my browser segfaults pretty often, that seems weird" to "maybe I have bad RAM?". if Linux had support for scanning for bad RAM on segfault, that'd be cool
interesting. the cases I've had (well, at least the ones I noticed) were really blatant - one specific bit, or multiple bits, of RAM being stuck to a fixed value
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If your concern is stuck bits I would suggest writing a boot time test to find and quarantine them. KISS. I am surprised you had systems that would even boot with a stuck bit.
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oh, actually, Linux has that already... I should probably turn that on. "memtest=2" on the cmdline
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I ran some personal experiments seeing how predictably I could approach the MTBF for memory (a few years back). The failure cases were interesting in that it would appear to peg a value but it would in fact ‘fade’. This made diagnosing the failure much more challenging (goal).
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"fade"? as in, a memory location stays at a fixed value for some time, but afterwards it behaves normally again? how long did those transient faults last?
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