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Date:      Sun, 24 May 2020 18:22:58 +0000
From:      bugzilla-noreply@freebsd.org
To:        transport@FreeBSD.org
Subject:   [Bug 227303] TCP: huge cwnd does not slowly decay while app/rwnd limited, interacts badly with rwnd autosize
Message-ID:  <bug-227303-38102-hbTxQYHWyh@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-227303-38102@https.bugs.freebsd.org/bugzilla/>
References:  <bug-227303-38102@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D227303

Richard Scheffenegger <rscheff@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |In Progress

--- Comment #8 from Richard Scheffenegger <rscheff@freebsd.org> ---
The partial fix is D21798 / rS355269. That takes care of "unbounded" growth=
 of
cwnd when the transmit side is application rather than cwnd limited. So cwnd
only grows, if it is actually restricting the transmission rate.

In order for cwnd to decay over time, when an session becomes app-limited a=
nd
the app keeps on sending small amounts of data to never enter after_idle, w=
ill
mean implementing New Congestion Window Validation (RFC7661).

--=20
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