> Note that ti's the same value as / . > > What is happening is a bit of a (rather neat IMO) optimization. > During startup, the OS dynamically picks an optimized version of libc > for the running system (based on the capabilities of the cpu) and > overlays the default libc with that version (note it doesn't modify > anything on disk, it just 'hides' the default one). In your case, it > determined that /usr/lib/libc/libc_hwcap2.so.1 was the best fit, and > so it loopback mounts that as /lib/libc.so.1. Because of that, the > used/free/etc. stats for the 'filesystem' (which is just a single > file) are the same as the underlying filesystem (i.e. /).
This optimization causes a lot of problems too -- e.g., how to back up or upgrade the hidden generic libc.so.1. It also leads to this meaningless and confusing output in df. -- meem
