Hi Dave,

some brief information regarding HyStart++ on Windows:
https://techcommunity.microsoft.com/t5/networking-blog/algorithmic-improvements-boost-tcp-performance-on-the-internet/ba-p/2347061
https://datatracker.ietf.org/meeting/113/materials/slides-113-tcpm-draft-ietf-tcpm-hystartplusplus-04-00

AFAIK, there is no Linux implementation for HyStart++, only HyStart:
https://www.kernel.org/doc/html/latest/networking/snmp_counter.html#tcp-hybrid-slow-start
(but I would be interested if there was a HyStart++ implementation for 
Linux; also there are several papers about HyStart but not HyStart++)

And HyStart++ should be available in FreeBSD:
https://reviews.freebsd.org/D33035
https://cgit.freebsd.org/src/commit/?id=653cf466f08584c0fd87bc336cdc1db08f0d4434

Best regards,
Joerg


On 28.05.23 14:46, Dave Taht via Bloat wrote:
> Does a linux implementation of this exist? It looks promising...
> 
> https://datatracker.ietf.org/doc/html/rfc9406
>