Re: Request for Testing: TCP RACK

W dniu 16.11.2023 o 10:13, tuexen@freebsd.org pisze:
> Dear all,
>
> recently the main branch was changed to build the TCP RACK stack
> which is a loadable kernel module, by default:
> https://cgit.FreeBSD.org/src/commit/?id=3a338c534154164504005beb00a3c6feb03756cc
That's really good news and long-awaited change. Thank you.
> As discussed on the bi-weekly transport call, it would be great if people
> could test the RACK stack for their workload. Please report any problems to the
> net@ mailing list or open an issue in the bug tracker and drop me a note via email.
> This includes regressions in CPU usage, regressions in performance or any other
> unexpected change you observe.
>
> You can load the kernel module using
> kldload tcp_rack
>
> You can make the RACK stack the default stack using
> sysctl net.inet.tcp.functions_default=rack
>
> Based on the feedback we get, the default stack might be switched to the
> RACK stack.

Yes, please do it, at least for CURRENT. Last problem I have spotted 
with RACK was fixed in June: it was missing support TCP-MD5:

https://cgit.freebsd.org/src/commit/?id=02b885b09d1e90574162a1442b9ede06cef2b13a

We switched to RACK since upgrading to early stable/13 and genuinely 
appreciate this gift from Netflix. The performance improvement is 
invaluable, both in a lossy LAN and on a long-haul overseas TCP connection.

> Please let me know if you have any questions.

Are any MFCs planned, especially to stable/14 ? Now, when stable/14 is 
almost in sync with main aka CURRENT it's an optimal time for such a 
MFC. When the change hits stable/14, it would be possible to test it 
extensively and have it fully functional in 14.1-RELEASE.

Best regards

-- 
Marek Zarychta