Ryan Underwood - On debugging the Linux kernel - #4
Ryan Underwood is a Staff SRE and tech lead on the Helix and Zookeeper SRE team at LinkedIn. Prior to LinkedIn, he was an SRE at Machine Zone and Google. Apart from his regular responsibilities, Ryan’s interest and expertise include debugging production kernel, I/O and containerization issues. His opinion about not treating software as a black box and his persistent approach to debugging complex problems are truly inspiring.
On several occasions, Ryan’s colleagues have leaned on him to solve an esoteric problem that everyone thought was insurmountable. Our main focus today is one such problem that Ryan and team ran into while upgrading machines to 4.x kernel that resulted in elevated 99th percentile latencies. We dive into what the problem was, how it was identified and how it was fixed. We discuss some of the tools and practices that are helpful in debugging system performance issues. And we also talk about Ryan’s background and how his curiosity landed him a career in Site Reliability Engineering.
Please enjoy this deeply technical and highly educational conversation with Ryan Underwood.
You can read the episode transcript here.
- Ryan Underwood on LinkedIn
- Fixing Linux filesystem performance regressions - Ryan’s blogpost that we dive into in this episode
Music CreditsVlad Gluschenko — Forest
License: Creative Commons Attribution 3.0
- David Henke - On building a culture of "Site Up" at LinkedIn and Yahoo! - #3
- Spoons (Daniel Spoonhower) - On building Lightstep, being customer focused, developing systems at Google scale and much more - #12
- Todd Underwood - On lessons from running ML systems at Google for a decade, what it takes to be a ML SRE, challenges with generalized ML platforms and much more - #10
- Charity Majors - On database outages, journey as a co-founder, thriving under pressure and growing as an engineer - #7
- Tammy Bryant Butow - On failure injection, chaos engineering, extreme sports and being curious - #6