I would like to inform Wireguard developers about the following. it seems that this [1] old AMD RDRAND problem is still present: RDRAND on AMD Ryzen 9 5900X is flakey - https://github.com/systemd/systemd/issues/18184 I own 2x Ryzen 3600, feel free to write me in case you would like to run some tests [1]: https://arstechnica.com/gadgets/2019/10/how-a-months-old-amd-microcode-bug-destroyed-my-weekend/
Hi Germano, On Mon, Jan 11, 2021 at 10:54 PM Germano Massullo <germano.massullo@gmail.com> wrote: > > I would like to inform Wireguard developers about the following. > it seems that this [1] old AMD RDRAND problem is still present: > RDRAND on AMD Ryzen 9 5900X is flakey - > https://github.com/systemd/systemd/issues/18184 > > I own 2x Ryzen 3600, feel free to write me in case you would like to run > some tests > > [1]: > https://arstechnica.com/gadgets/2019/10/how-a-months-old-amd-microcode-bug-destroyed-my-weekend/ I fixed this already, by removing the use of RDRAND from get_random_{u32,u64,int,long} entirely: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=69efea712f5b0489e67d07565aad5c94e09a3e52 This happened almost a year ago back in February, and was backported to the stable kernels too, which means you should have no issues finding a working kernel for your brand new Ryzen. Is this actually a problem you're experiencing or is your report mostly just speculation based on that systemd issue you linked to? Jason
Il 12/01/21 00:20, Jason A. Donenfeld ha scritto:
> Hi Germano,
>
> I fixed this already, by removing the use of RDRAND from
> get_random_{u32,u64,int,long} entirely:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=69efea712f5b0489e67d07565aad5c94e09a3e52
>
> This happened almost a year ago back in February, and was backported
> to the stable kernels too, which means you should have no issues
> finding a working kernel for your brand new Ryzen.
>
> Is this actually a problem you're experiencing or is your report
> mostly just speculation based on that systemd issue you linked to?
>
> Jason
Hi Jason, I did not know you already addressed the problem in the Linux
kernel, I just made a quick search in Wireguard mailing list but I did
not find any discussion related to RDRAND
I did not experience the problem (I haven't run proper tests yet), and I
haven't studied yet in detail all new replies in the thread. I just
wanted to let Wireguard developers know about this problem because I
thought it may affect Wireguard