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July 11 - 13, 2022 | Portland, Oregon + Virtual
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Wednesday, July 13 • 4:35pm - 5:15pm
[Virtual] Chasing Bad Checksums: A Journey through Ceph, TCMalloc, and the Linux kernel - Mauricio Faria de Oliveira & Dan Hill, Canonical

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In this talk Mauricio and Dan will discuss the steps for root cause analysis of transient checksum errors seen with Ceph on Ubuntu 18.04 LTS (probably issue #22464 [1]), covering components such as Ceph, TCMalloc, and the Linux kernel. They will describe the problem symptoms, approaches used for analysis, instrumentation, and synthetic reproducers. Drilling down to the root cause, and covering the proposed fix. There will be some (light) code walkthrough, changes for instrumentation, and usage of tracing tools in the Linux kernel (eg, ftrace, perf) thus experience with development, instrumentation, tracing, is helpful, but not strictly required. [1] Issue #22464 – https://tracker.ceph.com/issues/22464#note-50

avatar for Mauricio Faria de Oliveira

Mauricio Faria de Oliveira

Sustaining Engineer, Canonical
Mauricio works in the Sustaining Engineering team at Canonical, handling problem reports from Ubuntu Advantage support customers primarily in the Linux kernel, some userspace packages, and more recently, a bit of Ceph.

Dan Hill

Sustaining Engineer, Canonical
Dan is a Sustaining Engineer working in TechOps at Canonical. He has been working with distributed storage solutions since 2016, and has over 15 years of experience working with enterprise storage customers. Recently, Dan has been focused on Ceph performance tuning for application-specific... Read More →

Wednesday July 13, 2022 4:35pm - 5:15pm PDT
Regency Ballroom D