Re: Request for Testing: TCP RACK

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From: Marek Zarychta <zarychtam_at_plan-b.pwste.edu.pl>
Date: Tue, 16 Jan 2024 19:28:27 UTC
W dniu 17.11.2023 o 00:13, tuexen@fh-muenster.de pisze:
>> On Nov 16, 2023, at 17:50, Marek Zarychta <zarychtam@plan-b.pwste.edu.pl> wrote:
>>
>> 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.
> Let me bring that up on the next Transport call. Will report back.
>
> Best regards
> Michael

Thank you !

 From now on stable/14 and in the future on 14.1-RELEASE one will be 
able to load tcp_rack and tcp_bbr out of the box running GENERIC kernel.[1]

1. https://cgit.freebsd.org/src/commit/?id=123fd2a




-- 
Marek Zarychta