Subject: Re: [Bug 220774] New: netem is broken in 6.18

From: Stephen Hemminger <[email-masked]>
Date: Fri, 21 Nov 2025 16:13:22 -0800

On Fri, 21 Nov 2025 13:45:06 -0800
Cong Wang <[email-masked]> wrote:

> On Fri, Nov 21, 2025 at 07:52:37AM -0500, Jamal Hadi Salim wrote:
>  
> > [email-masked]: Can you please provide more details about what you
> > are trying to do so we can see if a different approach can be
> > prescribed?
> >   
> 
> An alternative approach is to use eBPF qdisc to replace netem, but:
> 1) I am not sure if we could duplicate and re-inject a packet in eBPF Qdisc
> 2) I doubt everyone wants to write eBPF code when they already have a
> working cmdline.
> 
> BTW, Jamal, if your plan is to solve them one by one, even if it could work,
> it wouldn't scale. There are still many users don't get hit by this
> regression yet (not until hitting LTS or major distro).
> 
> Regards,
> Cong

The bug still needs to be fixed.
eBPF would still have the same kind of issues.