Fix tcp/connection/accepted|initiated metrics for kernel 5.10 #266
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
* Add TCP Tail Loss Recovery Probes sampler via BPF * Add TCP Retransmit timeout sampler via BPF
WUMUXIAN
commented
Jan 5, 2022
| handler: "trace_finish_connect".to_string(), | ||
| probe_type: ProbeType::Kernel, | ||
| probe_location: ProbeLocation::Return, | ||
| probe_location: ProbeLocation::Entry, |
Contributor
Author
There was a problem hiding this comment.
On Kernel 5.4, it does not matter if we attach this at Entry or Return.
However on Kernel 5.10, if we attach it to Return, the sock* sk can't be used to get the stats from the map as the address are moved 128 bits. Now sure about why.
But using Entry here fix the issue.
WUMUXIAN
changed the title
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Problem
We have deployed Rezolus 2.15 on T3 canary instances and it showed that
tcp/connection/accepted
tcp/connection/initiated
are not working
I upgraded my VM to the same kernel version as T3 instances and confirmed that these two metrics stops working on kernel 5.10.
Solution
Made changes to the code to make sure these two metrics are compatible to 5.10.
Result
The two metrics work correctly on my 5.4 kernel as well as 5.10 kernel now.