Mykyta Yatsenko 84f7a49e76 selftests/bpf: Add resizable hashmap to benchmarks ... Support resizable hashmap in BPF map benchmarks. 1. LOOKUP (single producer, M events/sec) key | max | nr | htab | rhtab | ratio | delta ----+-----+-------+---------+---------+-------+------- 8 | 1K | 750 | 99.85 | 81.92 | 0.82x | -18 % 8 | 1K | 1K | 100.71 | 80.19 | 0.80x | -20 % 8 | 1M | 750K | 23.37 | 72.09 | 3.08x | +208 % 8 | 1M | 1M | 13.39 | 53.72 | 4.01x | +301 % 32 | 1K | 750 | 51.57 | 42.78 | 0.83x | -17 % 32 | 1K | 1K | 50.81 | 45.83 | 0.90x | -10 % 32 | 1M | 750K | 11.27 | 15.29 | 1.36x | +36 % 32 | 1M | 1M | 7.32 | 8.75 | 1.19x | +19 % 256 | 1K | 750 | 7.58 | 7.88 | 1.04x | +4 % 256 | 1K | 1K | 7.43 | 7.81 | 1.05x | +5 % 256 | 1M | 750K | 3.69 | 4.27 | 1.16x | +16 % 256 | 1M | 1M | 2.60 | 3.12 | 1.20x | +20 % Pattern: * Small map (1K): htab wins for 8 / 32 byte keys by 10-20% * Large map (1M): rhtab wins everywhere, up to 4x at high load factor with 8 byte keys. * Higher load factor amplifies rhtab's lead: rhtab grows the bucket array; htab stays at user-declared max. 2. FULL UPDATE (M events/sec per producer) htab per-producer: 20.33 22.02 19.27 23.61 24.18 23.17 21.07 mean 21.94 range 19.27 - 24.18 rhtab per-producer: 133.51 129.47 74.52 129.29 102.26 129.98 107.64 mean 115.24 range 74.52 - 133.51 speedup (mean): 5.25x (+425 %) In-place memcpy avoids the per-update alloc + RCU pointer swap that htab pays. 3. MEMORY value_size | htab ops/s | rhtab ops/s | htab mem | rhtab mem -----------+-------------+-------------+----------+---------- 32 B | 122.87 k/s | 133.04 k/s | 2.47 MiB | 2.49 MiB 4096 B | 64.43 k/s | 65.38 k/s | 6.74 MiB | 6.44 MiB rhtab/htab : +8 % ops, +0.8 % mem (32 B) +1 % ops, -4 % mem (4096 B) Throughput effectively tied SUMMARY * Small / well-fitting map: htab is faster (cache-friendly fixed bucket array), but only by ~10-20 %. * Large / high-load-factor map: rhtab is dramatically faster (1.2x to 4x) because rhashtable resizes to keep the load factor sane while htab stays stuck at user-declared max. * Update-heavy workloads: rhtab is ~5x faster per producer via in-place memcpy. * Memory benchmark: effectively on par. Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com> Link: https://lore.kernel.org/r/20260605-rhash-v7-12-5b8e05f8630d@meta.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2026-06-05 08:00:08 -07:00
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bench_bloom_filter_map.c	selftests/bpf: Set the default value of consumer_cnt as 0	2023-06-19 13:26:43 -07:00
bench_bpf_crypto.c	selftests: bpf: crypto: add benchmark for crypto functions	2024-04-24 16:01:10 -07:00
bench_bpf_hashmap_full_update.c	selftests/bpf: Add resizable hashmap to benchmarks	2026-06-05 08:00:08 -07:00
bench_bpf_hashmap_lookup.c	selftests/bpf: Add resizable hashmap to benchmarks	2026-06-05 08:00:08 -07:00
bench_bpf_loop.c	selftests/bpf: Set the default value of consumer_cnt as 0	2023-06-19 13:26:43 -07:00
bench_bpf_nop.c	selftests/bpf: Add bpf-nop benchmark for timing overhead baseline	2026-05-11 15:25:24 -07:00
bench_bpf_timing.c	selftests/bpf: Filter timing outliers with IQR in batch-timing library	2026-05-20 09:25:47 -07:00
bench_count.c	selftests/bpf: Set the default value of consumer_cnt as 0	2023-06-19 13:26:43 -07:00
bench_htab_mem.c	selftests/bpf: Add resizable hashmap to benchmarks	2026-06-05 08:00:08 -07:00
bench_local_storage_create.c	selftests/bpf: Remove kmalloc tracing from local storage create bench	2026-04-10 21:22:31 -07:00
bench_local_storage_rcu_tasks_trace.c	selftests/bpf: Set the default value of consumer_cnt as 0	2023-06-19 13:26:43 -07:00
bench_local_storage.c	selftests/bpf: Set the default value of consumer_cnt as 0	2023-06-19 13:26:43 -07:00
bench_lpm_trie_map.c	selftests/bpf: Add LPM trie microbenchmarks	2025-08-27 17:28:14 -07:00
bench_rename.c	selftests/bpf: Set the default value of consumer_cnt as 0	2023-06-19 13:26:43 -07:00
bench_ringbufs.c	selftests/bpf/benchs: Add overwrite mode benchmark for BPF ring buffer	2025-10-27 19:47:32 -07:00
bench_sockmap.c	selftests/bpf: Fix incorrect array size calculation	2025-09-09 09:23:47 -07:00
bench_strncmp.c	selftests/bpf: Set the default value of consumer_cnt as 0	2023-06-19 13:26:43 -07:00
bench_trigger.c	selftests/bpf: Add usdt trigger bench	2026-03-03 08:39:22 -08:00
bench_xdp_lb.c	selftests/bpf: Fix expired UDP LRU entries in XDP LB benchmark	2026-05-20 09:25:46 -07:00
run_bench_bloom_filter_map.sh	bpf/benchs: Add benchmarks for comparing hashmap lookups w/ vs. w/out bloom filter	2021-10-28 13:22:49 -07:00
run_bench_bpf_hashmap_full_update.sh	selftest/bpf/benchs: Fix a typo in bpf_hashmap_full_update	2023-02-15 16:29:31 -08:00
run_bench_bpf_loop.sh	selftest/bpf/benchs: Add bpf_loop benchmark	2021-11-30 10:56:28 -08:00
run_bench_htab_mem.sh	selftests/bpf: Add benchmark for bpf memory allocator	2023-07-05 18:36:19 -07:00
run_bench_local_storage_rcu_tasks_trace.sh	selftest/bpf/benchs: Make quiet option common	2023-02-15 16:29:31 -08:00
run_bench_local_storage.sh	selftests/bpf: Add benchmark for local_storage get	2022-06-22 19:14:33 -07:00
run_bench_rename.sh	selftests/bpf: Clean up fmod_ret in bench_rename test script	2023-08-14 18:43:04 +02:00
run_bench_ringbufs.sh	selftests/bpf: Add perfbuf multi-producer benchmark	2026-01-20 11:37:25 -08:00
run_bench_strncmp.sh	selftests/bpf: Add benchmark for bpf_strncmp() helper	2021-12-11 17:40:23 -08:00
run_bench_trigger.sh	selftests/bpf: add benchmark testing for kprobe-multi-all	2025-09-04 09:00:25 -07:00
run_bench_uprobes.sh	selftests/bpf: Add usdt trigger bench	2026-03-03 08:39:22 -08:00
run_bench_xdp_lb.sh	selftests/bpf: Add XDP load-balancer benchmark run script	2026-05-11 15:25:24 -07:00
run_common.sh	selftests/bpf: Add benchmark for local_storage get	2022-06-22 19:14:33 -07:00