Linux Work

• 1992: Created a Linux kernel driver for the 16-bit Future Domain SCSI adapter.
• 1993-1995: Coordinated the Linux Man Page Project (wrote dozens and edited hundreds of man pages); maintained the util-linux utility collection.
• 1994: Created complete operating system distribution (Bogus) for Linux that could be easily and automatically rebuilt from original sources. This work introduced the "pristine source plus patches" paradigm to the Linux community.
• 1995: Designed and implemented a prototype of RPM that encapsulated the ``pristine source plus patches'' paradigm (under contract to Red Hat Software).
• 1997: Co-architected a network protocol (DICT) for the transport of dictionary information and wrote a client and server for this protocol.
• 1998-2000: Co-architect of the Direct Rendering Infrastructure (DRI) for the XFree86 X server (this work introduced fast direct-rendered 3D graphics to the Linux world). Other X11 work during this period includes:
  • Designed kernel-level module architecture (DRM) to support the DRI under Linux; and implemented several kernel-level DRI/DRM drivers (e.g., 3Dlabs GMX-2000, 3dfx Voodoo3).
  • Designed and implemented several full kernel-level DRI/DRM drivers. 3Dlabs GMX-2000, 3dfx Voodoo3, and ATI Rage 128 graphics cards.
  • Implemented 2D XFree86 device driver for ATI Rage 128 card.
  • Designed and implemented Shared Memory Transport (SMT) for XFree86 by modifying low-level XFree86 protocol transport routines. This was submitted to XFree86 with the recommendation that it not be accepted -- performance analysis showed that, when video cards are well-matched to the CPU and memory subsystem, SMT is not a win.

  I no longer work on the DRI -- please don't send me email about it.

• 2001-2004: Implemented Distributed Multihead X, including performance analysis and design of input subsystem and protocol extension.
• 2003-2004: Implemented SELinux-compatible audit infrastructure for Linux 2.6 kernel.