# Linux Kernel Module Cheat

#### 24.9.1. gem5 arm Linux kernel patches boot speedup

We have observed that with the kernel patches, boot is 2x faster, falling from 1m40s to 50s.

With `ts`, we see that a large part of the difference is at the message:

    clocksource: Switched to clocksource arch_sys_counter

which takes 4s on the patched kernel, and 30s on the unpatched one! TODO understand why, especially if it is a config difference, or if it actually comes from a patch.