Re: TCP RACK stack by default for 15.0 RELEASE ?

Richard has clearly described the key differences between the current stacks. My tests on loopback path give some highlights on that.

https://wiki.freebsd.org/chengcui/tcp_loopback_perf
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> On Sep 8, 2025, at 03:32, Scheffenegger, Richard <rscheff@freebsd.org> wrote:
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>  
> Cheng has recently done some performance testing. The short answer is, that the base stack is much less computationally intensive and better suited for datacenter / high performance environments, while the RACK stack is optimized for the common Internet Server (Wifi/relatively low bandwidth) client use case...
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> Since fbsd is used in both these diverse environments, changing the default would probably lead to a different group of users having to tweak their settings off-default, while those who are already tweaking it, would no longer have to.
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> So, overall I don't see a compelling reason to change the default right now - but good reason to have both stacks around by default to be able to toggle between those if needed.
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> Richard
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>  > Mickaël Maillot <mickael.maillot@gmail.com> <mailto:mickael.maillot@gmail.com>
> > The tcp rack stack is around for more than a year now, will it be the default stack for 15.0-RELEASE ?
> 
> <OpenPGP_0x17BE5899E0B1439B.asc>

Best Regards,
Cheng Cui