News for hackers. Stuff that matters.

A comment on RDRAND on AMD Ryzen 9 5900X is flakey.

Re:RDRAND on AMD Ryzen 9 5900X is flakey by xeeeeeeeeeeenu on Monday January 11, 2021 @02:21PM (#25734727)
Why does this keep happening? RDRAND was broken in Ryzen 3xxx[1] and Jaguar/Puma[2] too.

[1] - https://arstechnica.com/gadgets/2019/10/how-a-months-old-amd...

[2] - https://linuxreviews.org/RDRAND_stops_returning_random_value...

[ Parent | on HN ]
Re:RDRAND on AMD Ryzen 9 5900X is flakey by Avamander on Monday January 11, 2021 @02:54PM (#25735417)
> Why does this keep happening?

Windows doesn't use RDRAND.

[ Parent | on HN ]
Re:RDRAND on AMD Ryzen 9 5900X is flakey by stabbles on Monday January 11, 2021 @02:53PM (#25735408)
I remember I ran into this Ryzen problem too. Spent a long time trying to figure out a bug in my code (random numbers were deterministic between runs), which ultimately was fixed by upgrading the bios.
[ Parent | on HN ]