Matthew Dillon

Template:Short description {{#invoke:Other people|otherPeople}} Template:Infobox person

Matthew Dillon (born 1966) is an American software engineer known for Amiga software,<ref name=informit-2007/> contributions to FreeBSD and for starting and leading the DragonFly BSD project since 2003.<ref name=informit-2007/><ref name=kerneltrap-2002/><ref name=kerneltrap-2007/><ref name=team/>

Biography

Dillon studied electronic engineering and computer science at the University of California, Berkeley, where he first became involved with BSD in 1985. He also became known for his Amiga programming,<ref name=informit-2007/> his C compiler DICE<ref name=dice-mia/> and his work on the Linux kernel.Template:R He founded and worked at Best Internet from 1994 until 1997, contributing to FreeBSD in that time.Template:R His "Diablo" internet news transit program was very popular with many ISPs.

In 1997, Dillon gained commit access to the FreeBSD code and heavily contributed to the virtual memory subsystem,<ref name=onlamp-2004/> amongst other contributions.

Concerned with problems he saw in the direction FreeBSD 5.x was headed in regards to concurrency,<ref name=onlamp-2004/> and coupled with the fact that Dillon's access to the FreeBSD source code repository was revoked due to a falling-out with other FreeBSD developers, he started the DragonFly BSD project in 2003, implementing the SMP model using light-weight kernel threads.Template:R The DragonFly project also led to the development of a new userspace kernel virtualisation technique in 2006, called Virtual Kernel,Template:R originally to ease the development and testing of subsequent kernel-level features;Template:R a new file system, called HAMMER, which he created using B-trees; HAMMER was declared production-ready with DragonFly 2.2 in 2009;<ref name=lwn-2010/> and, subsequently, HAMMER2, declared stable in 2018 with DragonFly 5.2.

Most recently, Dillon has gotten a number of headlines around CPU errata. In 2007, this was after Theo de Raadt of OpenBSD raised the alarm around the seriousness of some of the errata for Intel Core 2 family of CPUs.<ref name=lor-2007/> Dillon has independently evaluated Intel's errata, and did an overview of Intel Core errata as well, suggesting that several of them were so serious as to warrant avoiding any processor where the issues remain unfixed.<ref name=lor-2007/> Dillon has since been a fan of AMD processors, and, subsequently in 2012, he has discovered a brand-new deficiency in some AMD processors for which no existing erratum existed at the time.<ref name=theregister-amd-2012/> Dillon continued his work around CPU issues as late as 2018, presenting solutions to tackle the latest security vulnerabilities like Meltdown, some of which have been subsequently adopted by OpenBSD as well.<ref name=theregister-openbsd-meltdown-2018/>

Dillon was a frequent guest on bsdtalk during the runtime of the show,<ref name=bsdtalk/> and was interviewed several times for KernelTrap.<ref name=kerneltrap-2002/><ref name=kerneltrap-2007/>

External links

• Matt Dillon home page
• Matt Dillon IRC interview from SlashNet
• OSNews interview (March 13, 2004)