[dtn] Tc netem delay much larger
Marc Blanchet <marc.blanchet@viagenie.ca> Wed, 20 March 2024 23:38 UTC
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From: Marc Blanchet <marc.blanchet@viagenie.ca>
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Date: Thu, 21 Mar 2024 09:38:27 +1000
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Subject: [dtn] Tc netem delay much larger
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Hello (sorry for cross posting), Today during the Deepspace IP IETF side meeting, I presented news about a recent fix on linux tc netem delay. While this is not about bundle protocol specifications, I’m sure people here are interested. Currently, tc netem delay has a maximum value of 274s. Not bad for base testing, but not for simulating looong delays in space. After some email exchanges with iproute2/tc/netem author and maintainer, he provided a patch and we tested it since the last 2-3 weeks, works great! and the fix has been committed very recently to iproute2 repo. Commit: https://git.kernel.org/pub/scm/network/iproute2/iproute2.git/commit/?id=9a6b231ea1b09e450688c5814a4c89a57cdbee77 With that patch, we were able to do simulations with 18 hours one-way delay (36 hours RTT), from Earth to Voyager! (If you need help for getting or setting netem with this commit, send me a note, happy to help) Regards, Marc.
- [dtn] Tc netem delay much larger Marc Blanchet