open-iov.git/tools/cuda-ab/memset2d_probe.cu, branch master Open-IOV vGPU-IO: host-side GSP emulation for unmodified NVIDIA guest drivers https://git.vgpu.io/open-iov.git/atom?h=master 2026-10-22T13:40:06+00:00 tools/cuda-ab: isolation probes from the transformer/streams_events forensics 2026-10-22T13:40:06+00:00 Arthur Hanson Rasmusson arthur@vgpu.io 2026-10-22T13:40:06+00:00 urn:sha1:7df79840ceae3b0b05720c489afe35d471fa7e49 - tgemm_probe: minimal X[64x256]xW[256x256] GEMM isolation. Found the deterministic first-page corruption: after a forwarded launch (and sometimes already after the H2D upload) the FIRST 8 bytes of the first data-window page are replaced by that page's bytes at offset 8 (X[0..1] <- X[2..3]; vidmem dump confirms; OUT-UNCH shows chunk==guest), which corrupts GEMM row 0 for all 256 columns (bad=256/pass, identical across 3 passes). Not rel_mod-dependent (A/B at runtime). - streams_events_probe: per-buffer DPTRS + per-buffer bad + first-8 expected/actual for the 3-stream event chain (green on a clean boot, bad=131072 after several clients - the client-switch resolution class). - memset2d_probe: per-phase bad/PHIST for victory_memset2d (verified the r458 LINE_COUNT fix: bad_total=0, all three phases).