Adrian Chadd

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Adrian Chadd is an Australian software engineer and open-source developer prominent for his contributions to the FreeBSD operating system and the Squid caching proxy. He is a primary architect of FreeBSD's modern wireless networking stack and Receive Side Scaling (RSS) implementation. Throughout his career, Chadd has held senior engineering roles at Qualcomm Atheros, Netflix, and Meta Platforms.

Career

Early career and ISPs (1990s–2003)

Chadd began his career in the Australian telecommunications sector during the 1990s. He served as a systems architect for IP Exchange, an Australian virtual ISP, where he designed BGP and OSPF network topologies. In 2000, he worked with InterXion in Europe on the Zebra codebase to support meshed internet exchanges.

Squid and Caching (2000s)

During the 2000s, Chadd became a core developer for the Squid Web Cache project. His work focused on optimizing event-driven network IO and memory allocation to improve proxy performance. He was a "driving force" in the Squid-2 network core and addressed several high-profile vulnerabilities, including CVE-2007-6239.

FreeBSD and Wireless Networking

Chadd is a long-time FreeBSD committer, having taken stewardship of the `net80211` wireless stack. His notable technical contributions include:

  • 802.11n/ac Support: Leading the effort to bootstrap high-speed wireless support into the FreeBSD kernel.
  • Atheros Drivers: Maintaining and open-sourcing drivers for Atheros chipsets. In 2012, he collaborated with Linux developer Luis R. Rodriguez on a "Kill Proprietary Drivers" campaign to unify open-source hardware support.
  • Network RSS: Implementing Receive Side Scaling (RSS) in FreeBSD, which allows network traffic to be processed across multiple CPU cores without lock contention, a critical feature for 10GbE and 40GbE throughput.

Corporate Roles (2012–Present)

In 2013, Chadd joined the Netflix Open Connect team, where he optimized the FreeBSD network stack for the company's global content delivery network (CDN).

Since 2018, Chadd has worked at Meta Platforms (formerly Facebook) within the Reality Labs division. His work involves BSP bring-up and wireless framework design for augmented reality (AR) hardware, including Project Orion AR glasses and Meta Ray-Ban glasses.

Amateur Radio

Chadd is a licensed amateur radio operator with the callsign KK6VQK. He has been active in porting software-defined radio (SDR) tools like GNU Radio to FreeBSD.

Selected Presentations

  • TCP Hijacking – BSDCan (2008)
  • Let's kill all proprietary drivers for good – Linux Foundation Collaboration Summit (2012)
  • State of 802.11 in FreeBSD – BSDCan (2012)
  • Inside The Atheros WiFi Chipset – DEF CON 22 Wireless Village (2014)