This series addresses several test failures that occur sporadically on systems with many cores (32+), particularly on AMD Zen architectures. I think Ferruh may have addressed similar problems in earlier releases.
The root causes fall into three categories: 1. Missing rte_pause() in synchronization spinloops (patch 1) Tight spinloops without pause cause SMT thread starvation and unpredictable timing behavior. 2. Fixed iteration counts that don't scale (patch 2) The atomic test performs 1M iterations per worker regardless of core count. With 32+ cores, contention causes timeout failures. 3. File-prefix collisions during parallel test execution (patches 5-6) Multiple tests using the default "rte" prefix compete for the same fbarray files, causing EAL initialization failures. Additionally, two BPF-related fixes that I was seeing on this system. 4. Lack of error checking in BPF elf load test (patch 3) 5. Unsupported BPF instructions with newer clang (patch 4) Clang 20+ generates JMP32 instructions that DPDK BPF doesn't support. v2 - Drop the unnecessary fsync() - Rework the file prefix handling for trace tests Stephen Hemminger (6): test: add pause to synchronization spinloops test: fix timeout for atomic test on high core count systems test: fix error handling in ELF load tests test: fix unsupported BPF instructions in elf load test test: add file-prefix for all fast-tests on Linux test: fix trace_autotest_with_traces parallel execution app/test/bpf/meson.build | 3 +- app/test/suites/meson.build | 23 +++++++++---- app/test/test_atomic.c | 67 ++++++++++++++++++++++--------------- app/test/test_bpf.c | 3 +- app/test/test_threads.c | 17 +++++----- 5 files changed, 70 insertions(+), 43 deletions(-) -- 2.51.0
