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[204.195.96.226]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29b78740791sm7169085ad.56.2025.11.21.16.13.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Nov 2025 16:13:25 -0800 (PST) Date: Fri, 21 Nov 2025 16:13:22 -0800 From: Stephen Hemminger To: Cong Wang Cc: Jamal Hadi Salim , netdev@vger.kernel.org, kuba@kernel.org, linux-kernel@vger.kernel.org, will@willsroot.io, jschung2@proton.me, savy@syst3mfailure.io Subject: Re: [Bug 220774] New: netem is broken in 6.18 Message-ID: <20251121161322.1eb61823@phoenix.local> In-Reply-To: References: <20251110123807.07ff5d89@phoenix> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 21 Nov 2025 13:45:06 -0800 Cong Wang wrote: > On Fri, Nov 21, 2025 at 07:52:37AM -0500, Jamal Hadi Salim wrote: > > > jschung2@proton.me: 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.