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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Q8Mc2vD0gR85N1QmcgscuMS+0lrTEWpA76xYMN9gaau117WFYIrjmQkthOAqED7hs15egmuYp4QXlAkIHoMInXlcW6gvdM599TY3aypnlCfpfzQHXXdH4dUkSq/lT5H8AFrA/gc9qw7vpghi7NBFciZfpua1zyVuuWkSTwEuRQpGMUnEg4fMbeuQjoKiXrJrqKJxo1T3onQMHrPnK/k5gc/FYcGB9wz5VXuJkCO+Q3552XA6m7j/udxmFXYaDLjf/BQ8wK8SCYbSB2P0h7/0ZNw8xtY5k0XBAVD2qY0QQrQmu6FPybL/kanl1hQUz7ZbCxKbC/4/RGT9IF/+RsDavBnQCBT4MISwBo280i4oZpIDzdb8tvf0ctsDId0wbUyE+oONWJt4yqZxpGihjVNntpSmDskRQhbTtlymfolBmcNhqPLxu7LZ/vPNAFnNBh/D X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Apr 2026 14:56:19.4611 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0c34e9ef-1670-413f-5e0a-08dea1487a5d X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001D1.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR12MB8893 On 22/04/2026 18:22, Bruce Merry wrote: > Hello > > I'm hoping someone from NVIDIA Networking can help with this; I wasn't > sure of the best way to get in contact with the engineers working on > mlx5 kernel code so thought I'd try here. I'm trying to write some > (userspace) code using ibv_reg_mr_ex to register a memory region using > TLP Processing Hints (THP) to improve performance on an Epyc Turin > (Zen 5) system. However, in the kernel mlx5_st_create is bailing out > because of this check: > > if (!MLX5_CAP_GEN(dev, mkey_pcie_tph)) > return NULL; > > As far as I can tell, that is checking a capability bit returned by > the firmware. Right > > Before I spend a lot more time debugging, can you tell me whether > ConnectX-7 supports this feature at all (I'm on the latest 28.48.1000 > firmware)? I see it mentioned in release notes for ConnectX-8 > firmware, but not in ConnectX-7 release notes. > It's supported only on CX8 for now. Yishai > If ConnectX-7 does support it, do you have any tips on what might > cause that capability bit to be false and how to determine what the > cause is? For example, could that happen if the motherboard BIOS > doesn't support TPH? > > Thanks > Bruce