Day: March 8, 2016

Hammer not show

The ‘hammer show’ command can be used to dump the B-Tree structure of a Hammer volume, and CRC errors can be spotted.  It’s rare that anyone would need it, but if you do, this dumped information will include file hierarchy information. If that makes you a bit nervous to repost any of that information when […]

Improvements for kqueue and per-CPU caching

Sepherosa Ziehau has continued his quest of making large-scale data transmission on DragonFly effortless; his latest change has cut the kqueue contention rate by two-thirds when dealing with a connection rate of nearly 400,000 connections per second.  Note that’s number of connections, without even tracking the bandwidth used by each.