linux-kernel - Re: Fw: [Bug 220774] New: netem is broken in 6.18

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Message-ID: <aSH/edrbyD51K1Zo@pop-os.localdomain>
Date: Sat, 22 Nov 2025 10:22:49 -0800
From: Cong Wang <xiyou.wangcong@...il.com>
To: Jamal Hadi Salim <jhs@...atatu.com>
Cc: 정지수 <jschung2@...ton.me>,
	Stephen Hemminger <stephen@...workplumber.org>,
	netdev@...r.kernel.org, kuba@...nel.org,
	linux-kernel@...r.kernel.org, will@...lsroot.io,
	savy@...t3mfailure.io
Subject: Re: Fw: [Bug 220774] New: netem is broken in 6.18

On Sat, Nov 22, 2025 at 12:24:43PM -0500, Jamal Hadi Salim wrote:
> If you can talk about it: I was more interested in what your end goal is.
> From the dev name it seems $DEV is a wireless device? Are you
> replicating these RTP packets across different ssids mapped to
> different hw queues? Are you forwarding these packets? The ethtool
> config indicates the RX direction but the netem replication is on the
> tx.
> And in the short term if a tc action could achieve what you are trying
> to achieve - would that work for you?

I am not speaking for Ji-Soo, but which tc action are you talking about
here?

Personally, I am not aware of any tc action could achieve the same netem
duplication. gact offers some randomness, mirred offers duplication, but
it is not trivial to just combine them to be same as netem duplication.

Regards,
Cong Wang