Date: Mon, 18 Mar 2024 05:33:11 -0700 From: David Wolfskill <david@catwhisker.org> To: Mike Karels <mike@karels.net> Cc: tuexen@freebsd.org, Nuno Teixeira <eduardo@freebsd.org>, Drew Gallatin <gallatin@freebsd.org>, garyj@gmx.de, current@freebsd.org, net@freebsd.org, Randall Stewart <rrs@freebsd.org> Subject: Re: Request for Testing: TCP RACK Message-ID: <Zfg0hz8FF-grcBKT@albert.catwhisker.org> In-Reply-To: <6047C8EF-B1B0-4286-93FA-AA38F8A18656@karels.net> References: <CAFDf7ULtN9owoH-ns2OfR6ZhypNGxuNzkQbb2P9zR8ceFgaj5A@mail.gmail.com> <4FF534F6-B35D-4596-8D1E-226AD1347AC8@freebsd.org> <CAFDf7U%2BAjfeY%2Bqjq%2B-R71w5i1pRoxQdOmqJ9w4s1U13AA8-duA@mail.gmail.com> <C5D50314-4B0C-42F6-AA67-B5A32A4BA335@freebsd.org> <CAFDf7UKL6vtKo1Mn9Vw_5OD9Xubuw%2BdgS83WKwsiTUaXHs8D6Q@mail.gmail.com> <6e795e9c-8de4-4e02-9a96-8fabfaa4e66f@app.fastmail.com> <CAFDf7UKDWSnhm%2BTwP=ZZ9dkk0jmAgjGKPLpkX-CKuw3yH233gQ@mail.gmail.com> <CAFDf7UJq9SCnU-QYmS3t6EknP369w2LR0dNkQAc-NaRLvwVfoQ@mail.gmail.com> <A3F1FC0C-C199-4565-8E07-B233ED9E7B2E@freebsd.org> <6047C8EF-B1B0-4286-93FA-AA38F8A18656@karels.net>
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On Mon, Mar 18, 2024 at 07:26:10AM -0500, Mike Karels wrote:
> ...
> >> It would be so nice that we can have a sysctl tunnable for this patch
> >> so we could do more tests without recompiling kernel.
> > Thanks for testing!
> >
> > @gallatin: can you come up with a patch that is acceptable for Netflix
> > and allows to mitigate the performance regression.
>=20
> Ideally, tcphpts could enable this automatically when it starts to be
> used (enough?), but a sysctl could select auto/on/off.
>=20
> Mike
> ....
Or (at some risk of over-{complicat,engineer}ing things), perhaps
sysctl/tunable for high- and low-water marks?
Peace,
david (who is quite unlikely to be writing the code, so "grain of salt")
--=20
David H. Wolfskill david@catwhisker.org
Alexey Navalny was a courageous man; Putin has made him a martyr.
See https://www.catwhisker.org/~david/publickey.gpg for my public key.
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