The bytes and events data for NFS mounts in /proc/self/mountstats The per NFS mount mountstats performance stats (see here for an introduction) have two sets of high level statistics, reported in the bytes: and events: lines. Both of these come from counters that are described in comments in include/linux/nfs_iostat.h in the kernel source. Of the two, the simpler is bytes:. A typical bytes: line l