[PATCH bpf-next 0/4] selftests/bpf: XDP LB benchmark fixes

[Puranjay Mohan <puranjay@kernel.org>]

Three bug fixes and one improvement for the XDP LB and batch-timing
benchmarks.

The cold_lru validation was failing a lot because batch_hash could
compute to zero when batch_gen matched the CPU id. Similarly,
pre-populated UDP LRU entries had atime=0 so they'd expire immediately
on any CPU that calibration didn't warm. Both are fixed in patches 1-2.

Patch 3 lowers CALIBRATE_MAX_BATCH to stay under BPF_MAX_LOOPS.

Patch 4 adds IQR outlier filtering to the timing stats to stabilize
scenarios with high stddev.

Puranjay Mohan (4):
  selftests/bpf: Fix cold_lru producing zero batch_hash in XDP LB
    benchmark
  selftests/bpf: Fix expired UDP LRU entries in XDP LB benchmark
  selftests/bpf: Cap batch-timing calibration at BPF may_goto loop limit
  selftests/bpf: Filter timing outliers with IQR in batch-timing library

 .../selftests/bpf/benchs/bench_bpf_timing.c   | 28 ++++++++++++++++++-
 .../selftests/bpf/benchs/bench_xdp_lb.c       | 11 ++++++++
 .../selftests/bpf/progs/xdp_lb_bench.c        |  2 +-
 3 files changed, 39 insertions(+), 2 deletions(-)

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