Found: large ubatch (512) collapses MTP acceptance to ~25% (gen ~9 t/s); ubatch 128 with batch>=2048 triggers premature instant-EOS under 2 concurrent slots. ubatch 256 = ~30 t/s gen, concurrent-safe, ~330 t/s prefill.
Found: large ubatch (512) collapses MTP acceptance to ~25% (gen ~9 t/s); ubatch 128 with batch>=2048 triggers premature instant-EOS under 2 concurrent slots. ubatch 256 = ~30 t/s gen, concurrent-safe, ~330 t/s prefill.