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Message-ID: <8734alcdkk.fsf@gentoo.org>
Date: Fri, 25 Jul 2025 01:35:23 +0100
From: Sam James <sam@...too.org>
To: Schrodinger ZHU Yifan <i@...yi.fan>
Cc: "libc-coord@...ts.openwall.com" <libc-coord@...ts.openwall.com>
Subject: Re: vdso getrandom is slower than syscall on Zen5
Schrodinger ZHU Yifan <i@...yi.fan> writes:
> Hi,
>
> In some experiments, I find it interesting that if getrandom is used to generate long sequence of
> random bytes, it is actually slower than getrandom. This phenomenon depends on microarch and it is stable on Zen5. Is it
> because the kernel space getrandom does not use ChaCha20? I am not very familiar with the kernel space implementation.
>
> Benchmark results are available at: https://github.com/bytecodealliance/rustix/issues/1185
>
I'd probably file this as a glibc bug (or maybe bring it up on
libc-alpha and CC zx2c4). libc-coord is for coordination between
different libc impls on interfacts and such.
> Yifan
sam
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