Paul McKenney, inventor of Stochastic Fair Queueing (SFQ), inventor of RCU, solver of million year problems at IBM and now meta, and all around good speaker, is giving a talk on "Hunting Heisenbugs" 2:30PM EST Tuesday November 14th, 2023, at the Linux Plumbers conference.
https://lpc.events/event/17/contributions/1504/ A heisenbug is a bug that when you instrument the code to find it, vanishes. See wikipedia for more details. I have spent many months, and years, even - trying to turn heisenbugs into "Bohrbugs". Bufferbloat was, originally, essentially a heisenbug, until Tom Herbert invented BQL. Every engineer has a few in their backlog that keeps them awake at night. I have 3 outstanding, the biggest: I have been trying (in my spare time) for nearly a year now, trying to find a bug in the mt76's mu-mimo stack that causes excessive retransmits and latency under circumstances I can rarely replicate, which is proving more elusive to find as the infamous fq-crypto bug we had had that stalled make-wifi-fast project out for 4 horrible months, and stumped dozens of people. It is similarly damaging for users of that chipset, when it happens. https://blog.cerowrt.org/post/crypto_fq_bug/ -- :( My old R&D campus is up for sale: https://tinyurl.com/yurtlab Dave Täht CSO, LibreQos _______________________________________________ Starlink mailing list Starlink@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/starlink
