xv6-i386 is a perfect target for experimenting small features, like TSC and IOBM. My experiments are on different branches, and they could be used for learning the features. A small patch of ~300 lines is way better than diving into the SDM or Linux kernel code.
| branch | description |
|---|---|
| rdtsc | TSC mechanism (high-resolution timing) of x86 processors |
| porttest | Port I/O bitmaps |