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X-MS-Exchange-CrossPremises-SCL: 1 X-MS-Exchange-CrossPremises-Processed-By-Journaling: Journal Agent X-OrganizationHeadersPreserved: PRAP192MB1579.EURP192.PROD.OUTLOOK.COM X-Proofpoint-GUID: MLY6AAIyZAu3dZPvQzYNWn0JAS2YktZ1 X-Proofpoint-ORIG-GUID: MLY6AAIyZAu3dZPvQzYNWn0JAS2YktZ1 X-Authority-Analysis: v=2.4 cv=P+U6hjAu c=1 sm=1 tr=0 ts=68aec2a1 cx=c_pps a=0UdJJU0ysNg8wLXy93/pzg==:117 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=2OwXVqhp2XgA:10 a=8gLI3H-aZtYA:10 a=lfzfwBLCeWt4POdeWLEA:9 a=CjuIK1q_8ugA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODI3MDA3MSBTYWx0ZWRfXx+lSR729F0cY iW0gQzD5fTR0xLChBJf7V8DNGhIftIhwaJ2HUx/mWGOKP+KnUCorQXnQu48mYBX8Oab7GQ8OGLr LE5xh1r4BEu86fFVs9sm2XWqIJUwr5jZYUxMflnAEfZ6GzfRueAXYs5+tnsnjAyD+1cJw3P+hAC Ek3z6JICTX+5+YGXO8rIOCURRylNaWmOl8+dKpcdfhGvaKnfeg6OnpN9yJ19ZYCHz/KAv1PSLz0 h145F+GWDCip3BNf/LC1epxN6N0Kb3/r4zcVx+o0250sW/PX7Icgcwti4AQViKE9eKfQE3eaxTE RhHGb/XBGaWk5ZGv4OCq43+b59UcJ2LBYPYy2rpBj7/RZg/ZNh7B7HYeJy3Lh4= Am Wed, Aug 27, 2025 at 09:08:24AM +0100 schrieb Russell King (Oracle): > On Wed, Aug 27, 2025 at 07:57:28AM +0200, Alexander Wilhelm wrote: > > Hi Vladimir, > > > > One of our hardware engineers has looked into the issue with the 100M link and > > found the following: the Aquantia AQR115 always uses 2500BASE-X (GMII) on the > > host side. For both 1G and 100M operation, it enables pause rate adaptation. > > However, our MAC only applies rate adaptation for 1G links. For 100M, it uses a > > 10x symbol replication instead. > > This sounds like a misunderstanding, specifically: > > "our MAC only applies rate adaptation for 1G links. For 100M, it uses > 10x symbol replication instead." > > It is the PHY that does rate adaption, so the MAC doesn't need to > support other speeds. Therefore, if the PHY is using a 2.5Gbps link > to the MAC with rate adaption for 100M, then the MAC needs to operate > at that 2.5Gbps speed. > > You don't program the MAC differently depending on the media side > speed, unlike when rate adaption is not being used. You're right. The flow control with rate adaptation is controlled by PHY. The MAC should remain on the 2.5Gbps speed. Therefore I wonder why it uses 10x symbol repetition. Best regards Alexander Wilhelm