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We have now repeated the > test using Ubuntu's mainline build of Linux 7.2.6 > (7.2.6-070206-generic), with its in-tree mlx5_core driver. > > I checked the v7.2.6 source: it contains the small-frame guard from > commit e2466392a0b8496000e12181cb1ee1535eb0da25 In > mlx5e_handle_rx_cqe_mpwrq_shampo(), frames with > cqe_bcnt <= ETH_ZLEN + 2 * VLAN_HLEN set match = false and > flush = true [2]. > > The zero-filled corruption ending at the next 64-byte boundary in > GPU memory still reproduces with this kernel. > > We kept the same sender and receiver data-checking logic, with > tcp-data-split on and rx-gro-hw on. One additional environment > change is that the NVIDIA GPU driver was updated from 595.71.05 to > 595.91.07. The NIC firmware remains 32.43.2400 (MT_0000001117). > > We repeated the same eight message sizes, from 32 KiB to 4 MiB, > with 50 iterations per size: > > - All 400 iterations completed. > - 105 iterations passed; 295 contained corrupted data. > - 21,599 corrupted ranges were recorded, all zero-filled and > ending at the next 64-byte boundary in GPU memory. > - For each size from 256 KiB through 4 MiB, all 50 iterations > contained corruption. > - The full-message snapshots taken before and after > cuFlushGPUDirectRDMAWrites() were identical in all iterations. > > For example, in the first 32 KiB iteration, an 8-byte corrupted > range starts at offset 2147495416 bytes from the beginning of the > GPU buffer. This offset is 56 bytes into a 64-byte-aligned block, > so the eight zero bytes end exactly at the next 64-byte boundary. > > These results come from the reproducer's runtime byte comparisons. > > Could you suggest the next targeted checks or additional debug > information that would help narrow this down? > Did you also try CPU buffers? From the NIC perspective it shouldn't be any different. Could you share a program + reproduction steps? Thanks, Dragos