https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278666
Bug ID: 278666
Summary: [sctp] Heartbeat jittering is not +- anymore
Product: Base System
Version: Unspecified
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Hi,
When reading the SCTP RFC regarding the SCTP heartbeat timing, it says:
"On an idle destination address that is allowed to heartbeat, it is RECOMMENDED
that a HEARTBEAT chunk is sent once per RTO of that destination address plus
the protocol parameter 'HB.interval', with jittering of +/- 50% of the RTO
value and exponential backoff of the RTO if the previous HEARTBEAT chunk is
unanswered."
It was implemented like this previously, but it was later changed here:
https://cgit.freebsd.org/src/commit/?id=70e95f0b6917a8b8cd4a2a5f883f3e9753fc86d8
I am wondering if this can be considered a bug? Because previously, the jitter
could be like [-RTO/2, RTO/2], but now it is [0, RTO/2]. This results in a
longer path failover on average for idle paths that are not sending DATA chunks
and receiving SACK:s.
Thank you in advance!
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