netdev - Fwd: [Bug 220774] netem is broken in 6.18

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Message-ID: <CAM_iQpW7WE17Xad_YVsOpz5_+uJzB2_7zOPQE3xOoT-nt4UAXQ@mail.gmail.com>
Date: Sun, 23 Nov 2025 17:33:36 -0800
From: Cong Wang <xiyou.wangcong@...il.com>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: William Liu <will@...lsroot.io>, 
	Linux Kernel Network Developers <netdev@...r.kernel.org>, Jakub Kicinski <kuba@...nel.org>
Subject: Fwd: [Bug 220774] netem is broken in 6.18

---------- Forwarded message ---------
From: <bugzilla-daemon@...nel.org>
Date: Fri, Nov 21, 2025 at 3:39 PM
Subject: [Bug 220774] netem is broken in 6.18
To: <xiyou.wangcong@...il.com>


https://bugzilla.kernel.org/show_bug.cgi?id=220774

Gerlinde (lrGerlinde@...lfence.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |lrGerlinde@...lfence.com

--- Comment #2 from Gerlinde (lrGerlinde@...lfence.com) ---
You know, in our HA and ECMP setup we sometimes get this strange thing: packets
are not lost, but some flows get duplicated for a few hundert milliseconds. Not
all flows, only the unlucky ones that get hashed through the broken path. And
this makes debugging really a pain, because all metrics say “no loss”, but the
application still behave stupid.

So we use netem duplicate on a single mq-queue to copy exactly this situation.

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