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[82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4606f2b0c10sm44484375f8f.21.2026.06.16.05.46.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Jun 2026 05:46:30 -0700 (PDT) Date: Tue, 16 Jun 2026 13:46:29 +0100 From: David Laight To: Jakub Kicinski Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, 3chas3@gmail.com, mitch@sfgoth.com, linux-atm-general@lists.sourceforge.net, dwmw2@infradead.org Subject: Re: [PATCH net-next 1/9] atm: remove AAL3/4 transport support Message-ID: <20260616134629.41017dc4@pumpkin> In-Reply-To: <20260613201032.77274-2-kuba@kernel.org> References: <20260613201032.77274-1-kuba@kernel.org> <20260613201032.77274-2-kuba@kernel.org> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable On Sat, 13 Jun 2026 13:10:24 -0700 Jakub Kicinski wrote: > AAL3/4 is an obsolete connection-oriented ATM adaptation layer that has > seen no real use since the SMDS-era hardware it was designed for (90s?). ... =46rom what I remember they weren't really used even then. Apart from 'uncompressed 64k telephony audio' pretty much everything actual= ly used AAL5 so that data could be compressed. I do remember PCI ATM cards that could be used for TCP/ATM to the desktop. The equipment you needed in the network rack to make it work was stunning. Completely killed by 100M ethernet over twisted pair. David