[Bug 286631] TCP SACK: CWND set to 2 MSS after successful SACK recovery

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From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 06 Jun 2025 23:35:06 UTC

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286631

--- Comment #2 from JY <yjaeyong@gmail.com> ---
Created attachment 261049
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=261049&action=edit
pcap for congestion window drop after successful recovery

I attached a pcap.

We are not actually using the FreeBSD OS. We are using user-space TCP stack
with  fstack and cherry-picked the releases from your 14.3 to our software. In
our system, unfortunately we don't have black-box logging.

If you let me know specific part you want logging, I can rerun the test collect
the logs.

I will also share the logs that I added in tcp_sack_doack, which gives me clue
for this suspection.

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