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Message-ID: <qUs57xPmdRx-LON4JLFM9CP55yYbXGv79gtckb-99BiIJ2N1JbT_YAh09Jq8PPqTm3vtLOhlGeexAymonSIz6K3R5V2c0h4mcuXJmMFsTlY=@zhuyi.fan>
Date: Thu, 24 Jul 2025 16:35:14 +0000
From: Schrodinger ZHU Yifan <i@...yi.fan>
To: "libc-coord@...ts.openwall.com" <libc-coord@...ts.openwall.com>
Subject: vdso getrandom is slower than syscall on Zen5
Hi,
In some experiments, I find it interesting that if getrandom is used to generate long sequence ofrandom 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
Yifan
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