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DragonFly is an operating system and environment originally based on FreeBSD. DragonFly branched from FreeBSD in 2003 in order to develop a radically different approach to concurrency, SMP, and most other kernel subsystems.

DragonFly belongs to the same class of operating system as BSD and Linux and is based on the same UNIX ideals and APIs. DragonFly gives the BSD base an opportunity to grow in an entirely different direction from the one taken in the FreeBSD-5 series.

Kernel changes

• Ported tmpfs (efficient memory filesystem) from NetBSD
• Added support for minidumps
• Added swapcache support for SSDs
• Ported POSIX Message Queues from NetBSD (Google Summer of Code Project).
• Updated Linuxulator (now runs java, flash,...) for i386
• fixed vinum root mounts
• Added watchdog framework (compatible with watchdogd(8))
• Added gpio framework
• Ported minidumps from FreeBSD (enabled by default)
• Added vkernel64 (64-bit vkernels - experimental)
• Added hotplug pseudo-device
• Removed msfbufs and reimplemented sfbufs as a consumer of the newly added lwbufs (lightweight buffers)
• fixed checkpointing
• Updated opencrypto from FreeBSD-current
• Updated ACPI from FreeBSD 7.2
• Updated CPU initialization code From FreeBSD
• Serious reduction in KVM use for i386
• KVM expanded to 8GB for x86_64
• Major performance fixes for random I/O

HAMMER changes

• Updated to HAMMER version 4
• snapshot settings and snapstops moved out of /snapshots and into meta-data
• REDO generation and recovery added to support fast fsync
• Extended 'hammer snapls' output to print mountpoints and snapshot notes.
• 'hammer viconfig' takes editor preference into account now
• Numerous low-memory deadlocks fixed

Hardware changes (non-networking)

• uchcom(4): The driver for WinChipHead CH341/CH340 is now working stable
• glxsb(4): The driver has been imported from FreeBSD
• hifn(4): The driver has been fixed to work with updated opencrypto
• cs5536: Added support for watchdog and gpio on this chip
• nsclpcsio(4): The driver has been imported from OpenBSD
• Geode LX: Enable identification and features of this CPU
• New aibs(4) driver for ASUSTeK AI Booster ACPI ATK0110 voltage, temperature and fan sensors
• New kate(4) and km(4) drivers for AMD Family 0Fh, 10h and 11h AMD64 temperature sensors
• New aps(4) driver for ThinkPad Active Protection System accelerometer
• New wbsio(4) driver for Winbond LPC Super I/O attachment of lm(4) on any ISA port

Hardware changes (networking)

• Imported the alc(4) driver for Atheros AR8131/AR8132 NICs
• Imported the e1000(4) driver from FreeBSD for Intel Pro/1000 NICs

Userland changes

• null mounts now accept -o update
• awk(1): increased input field separator width to handle extended regexps.
• cpdup(1): added -VV option to verify file's contents and ignore mtime entirely.
• mount_nfs(8): rdirplus is now the default
• periodic(8) security now also reports pkgsrc vulnerabilities
• watchdogd: import from OpenBSD
• hotplugd(8): import from OpenBSD

amd64 related changes

• amd64 has been renamed to x86_64
• 64-bit vkernels now work on 64-bit boxes

Removals

• The T/TCP extension is no longer supported

Contributed Software

• Updated BIND to 9.5.2-P3 incl. DNSSEC support available by default
• Updated SENDMAIL to 8.14.4
• Updated wpa_supplicant to 0.6.10
• Updated hostapd to 0.6.10
• Updated groff to 1.20.1
• Updated file to 5.04
• Updated ncurses to 5.7
• Updated top to 3.8beta1 including DragonFly specific patches
• Updated less to 436
• Updated openssh to 5.3p1 (with HPN patch)
• Updated gcc 4.4 to 4.4.2
• Added binutils 2.20
• Added cryptodev support to OpenSSL

Security related

• ssh server: change defaults for new installations to disallow plain text passwords and allow root login via public key