Topic: /dev/urandom performance regression with 4.9.176 kernel
Since 4.9.176 kernel update, i'm having huge performance issues when using /dev/urandom (to secure erase a usb key), it happens with USB2 or USB3.
To be more specific, it writes at 5MB/s with a HUGE IO/WAIT (almost 80%) (instead of 30MB/s with USB2, and 80MB/s with USB3 before updating kernel)
At first, I thought my usb device was faulty but on an other machine running Gentoo (with 4.19.44 kernel), the issue is not present.
By the way, it seems to affect only USB flash devices, as using /dev/urandom to erase a SATA disk (connected through SATA port or with SATA to USB adapter still works just fine)
Anyone else having the same issue ? Easy to replicate if you have a usb key laying around. I'm not sure what is causing the issue. With previous kernel, it was working fine.