| abac8acb | 20-May-2026 |
Puranjay Mohan <puranjay@kernel.org> |
selftests/bpf: Filter timing outliers with IQR in batch-timing library
System noise (timer interrupts, scheduling) can inflate the reported
stddev. tcp-v4-syn showed stddev 37.86 ns without filteri
selftests/bpf: Filter timing outliers with IQR in batch-timing library
System noise (timer interrupts, scheduling) can inflate the reported
stddev. tcp-v4-syn showed stddev 37.86 ns without filtering vs
0.16 ns with filtering on the same run data.
Filter samples outside [Q1 - 1.5*IQR, Q3 + 1.5*IQR] before computing
statistics. Scenarios with genuinely wide distributions have large IQR
so the fences stay wide and the filter has minimal effect.
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260520133338.3392667-4-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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| 51312b63 | 28-Apr-2026 |
Puranjay Mohan <puranjay@kernel.org> |
selftests/bpf: Add XDP load-balancer benchmark run script
Add a convenience script that runs all 24 XDP load-balancer scenarios
and formats the results as a table with median, stddev, and p99
column
selftests/bpf: Add XDP load-balancer benchmark run script
Add a convenience script that runs all 24 XDP load-balancer scenarios
and formats the results as a table with median, stddev, and p99
columns.
./benchs/run_bench_xdp_lb.sh
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260427232313.1582588-8-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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| a4b5ba81 | 28-Apr-2026 |
Puranjay Mohan <puranjay@kernel.org> |
selftests/bpf: Add XDP load-balancer benchmark driver
Wire up the userspace side of the XDP load-balancer benchmark.
24 scenarios cover the full code-path matrix: TCP/UDP, IPv4/IPv6,
cross-AF encap
selftests/bpf: Add XDP load-balancer benchmark driver
Wire up the userspace side of the XDP load-balancer benchmark.
24 scenarios cover the full code-path matrix: TCP/UDP, IPv4/IPv6,
cross-AF encap, LRU hit/miss/diverse/cold, consistent-hash bypass,
SYN/RST flag handling, and early exits (unknown VIP, non-IP, ICMP,
fragments, IP options).
Before benchmarking each scenario validates correctness: the output
packet is compared byte-for-byte against a pre-built expected packet
and BPF map counters are checked against the expected values.
Usage:
sudo ./bench -a -w3 -p1 xdp-lb --scenario tcp-v4-lru-hit
sudo ./bench xdp-lb --list-scenarios
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260427232313.1582588-7-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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| dcf11479 | 28-Apr-2026 |
Puranjay Mohan <puranjay@kernel.org> |
selftests/bpf: Add bpf-nop benchmark for timing overhead baseline
Add a minimal benchmark that measures the overhead of the batch-timing
infrastructure itself. The BPF program runs an empty BENCH_BP
selftests/bpf: Add bpf-nop benchmark for timing overhead baseline
Add a minimal benchmark that measures the overhead of the batch-timing
infrastructure itself. The BPF program runs an empty BENCH_BPF_LOOP body
(~1.5-2 ns/op), establishing the floor cost that all timing-library
benchmarks include.
[root@virtme-ng tools/testing/selftests/bpf]# sudo ./bench -a -p8 bpf-nop
Setting up benchmark 'bpf-nop'...
Benchmark 'bpf-nop' started.
bpf-nop: median 1.82 ns/op, stddev 0.01, p99 1.86 (1754 samples)
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260427232313.1582588-4-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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| f8598132 | 09-Sep-2025 |
Jiayuan Chen <jiayuan.chen@linux.dev> |
selftests/bpf: Fix incorrect array size calculation
The loop in bench_sockmap_prog_destroy() has two issues:
1. Using 'sizeof(ctx.fds)' as the loop bound results in the number of
bytes, not the
selftests/bpf: Fix incorrect array size calculation
The loop in bench_sockmap_prog_destroy() has two issues:
1. Using 'sizeof(ctx.fds)' as the loop bound results in the number of
bytes, not the number of file descriptors, causing the loop to iterate
far more times than intended.
2. The condition 'ctx.fds[0] > 0' incorrectly checks only the first fd for
all iterations, potentially leaving file descriptors unclosed. Change
it to 'ctx.fds[i] > 0' to check each fd properly.
These fixes ensure correct cleanup of all file descriptors when the
benchmark exits.
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Jiayuan Chen <jiayuan.chen@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250909124721.191555-1-jiayuan.chen@linux.dev
Closes: https://lore.kernel.org/bpf/aLqfWuRR9R_KTe5e@stanley.mountain/
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| a85d8887 | 04-Sep-2025 |
Menglong Dong <menglong8.dong@gmail.com> |
selftests/bpf: add benchmark testing for kprobe-multi-all
For now, the benchmark for kprobe-multi is single, which means there is
only 1 function is hooked during testing. Add the testing
"kprobe-mu
selftests/bpf: add benchmark testing for kprobe-multi-all
For now, the benchmark for kprobe-multi is single, which means there is
only 1 function is hooked during testing. Add the testing
"kprobe-multi-all", which will hook all the kernel functions during
the benchmark. And the "kretprobe-multi-all" is added too.
Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
Link: https://lore.kernel.org/r/20250904021011.14069-4-dongml2@chinatelecom.cn
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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