From: Andrew Lunn <andrew@lunn.ch>
To: David Jander <david@protonic.nl>
Cc: Jonas Rebmann <jre@pengutronix.de>,
Vladimir Oltean <olteanv@gmail.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>,
Shengjiu Wang <shengjiu.wang@nxp.com>,
Shawn Guo <shawnguo@kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Vladimir Oltean <vladimir.oltean@nxp.com>,
netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org,
imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org,
Lucas Stach <l.stach@pengutronix.de>,
Oleksij Rempel <o.rempel@pengutronix.de>
Subject: Re: [PATCH v2 3/3] arm64: dts: add Protonic PRT8ML board
Date: Thu, 18 Sep 2025 17:04:55 +0200 [thread overview]
Message-ID: <7f1d9289-4102-4db9-a2bb-ff270e8871b7@lunn.ch> (raw)
In-Reply-To: <20250918165156.10e55b85@erd003.prtnl>
> Yes, unfortunately the SJA1105Q does not support PAUSE frames, and the i.MX8MP
> FEC isn't able to sustain 1000Mbps (only about 400ish) due to insufficient
> internal bus bandwidth. It will generate PAUSE frames, but the SJA1105Q
> ignores these, leading to packet loss, which is obviously worse than
> restricting this link to 100Mbps. Ironically both chips are from the same
> manufacturer, yet are incompatible in this regard.
Thanks for the explanation. Maybe add a comment that the bandwidth is
limited due to the lack of flow control resulting in packet loss in
the FEC.
Anything which looks odd deserves a comment, otherwise somebody will
question it....
Andrew
next prev parent reply other threads:[~2025-09-18 15:05 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-18 12:19 [PATCH v2 0/3] Mainline Protonic PRT8ML board Jonas Rebmann
2025-09-18 12:19 ` [PATCH v2 1/3] dt-bindings: net: dsa: nxp,sja1105: Add reset-gpios property Jonas Rebmann
2025-09-18 15:32 ` Frank Li
2025-09-22 17:33 ` Rob Herring (Arm)
2025-09-22 17:35 ` Vladimir Oltean
2025-09-18 12:19 ` [PATCH v2 2/3] dt-bindings: arm: fsl: Add Protonic PRT8ML Jonas Rebmann
2025-09-18 12:19 ` [PATCH v2 3/3] arm64: dts: add Protonic PRT8ML board Jonas Rebmann
2025-09-18 14:14 ` Andrew Lunn
2025-09-18 14:51 ` David Jander
2025-09-18 15:04 ` Andrew Lunn [this message]
2025-09-18 15:33 ` David Jander
2025-09-19 5:08 ` Oleksij Rempel
2025-09-19 7:31 ` David Jander
2025-09-18 14:18 ` Andrew Lunn
2025-09-18 15:01 ` Jonas Rebmann
2025-09-18 14:50 ` [PATCH v2 0/3] Mainline " Rob Herring (Arm)
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