Professional activities

I am a computer programmer. I've been doing contract work for the past 15 years. My specific areas of expertise include TCP/IP networking and BSD and Linux kernels. I am available for custom engineering work. Please contact me at hsu@dragonflybsd.org or (408) 270-6175.

Sample work committed into the FreeBSD and DragonFlyBSD kernel include

a complete implementation of TCP SACK (RFC 3708 and RFC3517) with D-SACK (RFC2883)
implemented TCP NewReno (RFC3782)
larger initial congestion windows (RFC3390)
TCP Limited Transmit (RFC3042)
TCP Appropriate Byte Counting (RFC3465)
implemented TCP Eifel Detection (RFC3522)
an object cache implementation (aka Sun slab allocator [1] [2])
O(log n) file descriptor allocation
the first port of Java to FreeBSD [3]

I also teach professionally. My previous classes include

Java Programming for UC Berkeley Extension
Linux kernel seminars at conferences such as the 2004 Australian Unix User Group Conference
personalized in-house training at private companies

A resume is available on request.

Talks given

BSDCon 2003 San Mateo (pictures, more pictures)
AsiaBSDCon 2004
Tokyo 2004
NYCBSDCon 2005

Papers

Hsu, "Reasoning About SMP in FreeBSD", Proceedings of the BSDCon 2003 Conference, Usenix, 2003.

Hsu, "The DragonFlyBSD Operating System", Proceedings of the 2004 AsiaBSDCon, Usenix, 2004.

Named contributor to

[RFC3649] "HighSpeed TCP for Large Congestion Windows", 2003.

[RFC3782] "The NewReno Modification to TCP's Fast Recovery Algorithm", 2004.

Personal

I have two passions in life: wushu and programming. I like all forms of programming, but mostly I program on the BSD kernel. I've been part of the FreeBSD Project since 1994 and was one of the first 10 FreeBSD committers, which grants write access to the master FreeBSD source repository. Since that time, I have been offered an OpenBSD commit bit, worked on NetBSD professionally, and now spend most of my time working on the DragonFlyBSD fork of FreeBSD. Some sample work I've done to the FreeBSD kernel can be found here and to the DragonFlyBSD kernel here.

Recent Trips

I travel a lot, both to go to conferences to give talksIn my spare time, I enjoy traveling and skiing.

Hawaii
Australia
Shanghai
Hong Kong
Macao
Zhuhai
Xiamen
Changsha
NY