When is a 64-bit counter not a 64-bit counter?

ContentsTL;DRThe problemAbout octet countersWrapping64-bit counters to the rescueExamining the sysfs files64-bit counters not to the rescueWhat a difference a minute makesThe bug…when you run a Xen device backend (commonly dom0) on a kernel version earlier than 4.10, e.g. Debian stable. TL;DR ^ Xen netback devices used 32-bit counters until that bug was fixed and released … Continue reading When is a 64-bit counter not a 64-bit counter?