Guy Tzalik
Director Of SW Networking at Xsight Labs
Israel
Summary
👤
Senior🎓
Top SchoolGuy Tzalik is a networking-focused software leader with over a decade of hands-on experience designing and shipping OS-level drivers for Linux, Windows, DPDK, FreeBSD and ESXi. He has led cross-border teams at AWS delivering the ENA/EFA drivers that power EC2 networking and now directs SW Networking at Xsight Labs, combining deep protocol expertise (Ethernet 802.3, Wi‑Fi 802.11) with NAND/embedded storage experience. Known for pragmatic, data‑path optimizations, his contributions include FreeBSD improvements to Amazon's ENA/EFA drivers such as mbuf defragmentation and robust reset handling. He balances management and coding fluency, mentoring senior engineers while remaining operationally involved in critical driver subsystems. Based in Israel, Guy brings a systems-first mindset that helps bridge low-level performance tuning and product-grade reliability.
8 years of coding experience
13 years of employment as a software developer
High School Computer Science, High School Computer Science at ORT Kiryat Bialik High Schoolbsc computer science, bsc computer science at University of Haifa
Github Skills (6)
c1710
kernel10
driver10
c1110
kernel-mode10
freebsd10
Programming languages (1)
Github contributions (1)
amzn/amzn-drivers
Jun 2017 - Dec 2020
Official AWS drivers repository for Elastic Network Adapter (ENA) and Elastic Fabric Adapter (EFA)
Role in this project:
Back-end Developer
Back-end DeveloperContributions:17 commits, 27 PRs, 31 pushes in 3 years 7 months
Contributions summary:Guy's contributions center on enhancing the FreeBSD driver for Amazon's Elastic Network Adapter (ENA) and Elastic Fabric Adapter (EFA). They updated the driver version, added FreeBSD-specific strings to driver files, and implemented mbuf defragmentation to handle long mbuf chains. Further improvements involved adding error handling for the reset task initialization and incorporating locks for critical `ena_up` and `ena_down` functions.
driversfabricelasticadapterefa
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