Re: HEADS UP: TCP CUBIC Broken on 12.0-RELEASE/STABLE

2018-12-16 Thread Matt Garber
On Sun, Dec 16, 2018 at 11:44 AM Kurt Jaeger wrote: > Will CUBIC be used if the system is running 12.0, or does it only happen > if one actively configures the use of the algorithm ? > > Can the use be detected somehow ? > This only happens if someone explicitly configured the use of the alterna

HEADS UP: TCP CUBIC Broken on 12.0-RELEASE/STABLE

2018-12-16 Thread Matt Garber
Hi all: Just a heads-up for those beginning to test or use FreeBSD 12.0-RELEASE or 12/STABLE, the alternate TCP congestion control algorithm CUBIC (cc_cubic) is currently broken and causes complete stalls of certain network traffic (e.g., rsync, git checkouts, etc.), as well as what appears to