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Subject[PATCH net-next v3 0/3] add benchmark selftest and optimization for ptr_ring
Date
Patch 1: add a selftest app to benchmark the performance
of ptr_ring.
Patch 2: move r->queue[] clearing after r->consumer_head
updating.
Patch 3: add barrier to ensure the visiblity of r->queue[].

V3: add patch 3 and address most of Michael's comment.
V2: add patch 1 and add performance data for patch 2.

---
Performance raw data using "perf stat -r" cmd, comparison
is also done in patch 2/3.
ptr_ring_test_org: patch 1
ptr_ring_test_opt1: patch 1 + patch 2
ptr_ring_test_opt2: patch 1 + patch 2 + patch 3


x86_64(as there is other workload in the x86_64 system, so
run 1000 times to get more accurate result):

Performance counter stats for './ptr_ring_test_org -s 1000 -m 1 -N 100000000' (1000 runs):

5,291.83 msec task-clock # 1.994 CPUs utilized ( +- 0.41% )
690 context-switches # 0.130 K/sec ( +- 3.65% )
8 cpu-migrations # 0.002 K/sec ( +- 5.70% )
291 page-faults # 0.055 K/sec ( +- 0.05% )
12,660,040,758 cycles # 2.392 GHz ( +- 0.41% )
24,202,160,722 instructions # 1.91 insn per cycle ( +- 0.06% )
3,559,123,597 branches # 672.569 M/sec ( +- 0.07% )
8,009,010 branch-misses # 0.23% of all branches ( +- 0.11% )

2.6538 +- 0.0109 seconds time elapsed ( +- 0.41% )

Performance counter stats for './ptr_ring_test_opt1 -s 1000 -m 1 -N 100000000' (1000 runs):

5,064.95 msec task-clock # 1.992 CPUs utilized ( +- 0.55% )
668 context-switches # 0.132 K/sec ( +- 4.20% )
9 cpu-migrations # 0.002 K/sec ( +- 4.45% )
291 page-faults # 0.057 K/sec ( +- 0.06% )
12,117,262,182 cycles # 2.392 GHz ( +- 0.55% )
22,586,035,716 instructions # 1.86 insn per cycle ( +- 0.08% )
3,404,652,345 branches # 672.199 M/sec ( +- 0.10% )
7,864,190 branch-misses # 0.23% of all branches ( +- 0.16% )

2.5422 +- 0.0142 seconds time elapsed ( +- 0.56% )

Performance counter stats for './ptr_ring_test_opt2 -s 1000 -m 1 -N 100000000' (1000 runs):

5,105.33 msec task-clock # 1.995 CPUs utilized ( +- 0.47% )
589 context-switches # 0.115 K/sec ( +- 4.24% )
11 cpu-migrations # 0.002 K/sec ( +- 4.24% )
292 page-faults # 0.057 K/sec ( +- 0.04% )
12,214,160,307 cycles # 2.392 GHz ( +- 0.47% )
22,756,292,370 instructions # 1.86 insn per cycle ( +- 0.10% )
3,429,218,233 branches # 671.694 M/sec ( +- 0.12% )
7,921,984 branch-misses # 0.23% of all branches ( +- 0.15% )

2.5587 +- 0.0122 seconds time elapsed ( +- 0.47% )


-------------------------------------------------------------------------------------------------
arm64(using taskset to avoid the numa effects):

Performance counter stats for 'taskset -c 0-1 ./ptr_ring_test_org -s 1000 -m 1 -N 100000000' (100 runs):

4172.83 msec task-clock # 1.999 CPUs utilized ( +- 0.01% )
54 context-switches # 0.013 K/sec ( +- 0.29% )
1 cpu-migrations # 0.000 K/sec
115 page-faults # 0.028 K/sec ( +- 0.16% )
10848085945 cycles # 2.600 GHz ( +- 0.01% )
25808501369 instructions # 2.38 insn per cycle ( +- 0.00% )
<not supported> branches
11190266 branch-misses ( +- 0.02% )

2.087205 +- 0.000130 seconds time elapsed ( +- 0.01% )


Performance counter stats for 'taskset -c 0-1 ./ptr_ring_test_opt1 -s 1000 -m 1 -N 100000000' (100 runs):

3774.91 msec task-clock # 1.999 CPUs utilized ( +- 0.03% )
50 context-switches # 0.013 K/sec ( +- 0.36% )
1 cpu-migrations # 0.000 K/sec
114 page-faults # 0.030 K/sec ( +- 0.15% )
9813658996 cycles # 2.600 GHz ( +- 0.03% )
23920189000 instructions # 2.44 insn per cycle ( +- 0.01% )
<not supported> branches
10018927 branch-misses ( +- 0.04% )

1.888224 +- 0.000541 seconds time elapsed ( +- 0.03% )

Performance counter stats for 'taskset -c 0-1 ./ptr_ring_test_opt2 -s 1000 -m 1 -N 100000000' (100 runs):

3785.79 msec task-clock # 1.999 CPUs utilized ( +- 0.03% )
49 context-switches # 0.013 K/sec ( +- 0.32% )
1 cpu-migrations # 0.000 K/sec
114 page-faults # 0.030 K/sec ( +- 0.15% )
9842067534 cycles # 2.600 GHz ( +- 0.03% )
24074397270 instructions # 2.45 insn per cycle ( +- 0.01% )
<not supported> branches
10091918 branch-misses ( +- 0.04% )

1.893673 +- 0.000508 seconds time elapsed ( +- 0.03% )

Yunsheng Lin (3):
selftests/ptr_ring: add benchmark application for ptr_ring
ptr_ring: move r->queue[] clearing after r->consumer_head updating
ptr_ring: add barrier to ensure the visiblity of r->queue[]

MAINTAINERS | 5 +
include/linux/ptr_ring.h | 52 ++++--
tools/testing/selftests/ptr_ring/Makefile | 6 +
tools/testing/selftests/ptr_ring/ptr_ring_test.c | 224 +++++++++++++++++++++++
tools/testing/selftests/ptr_ring/ptr_ring_test.h | 130 +++++++++++++
5 files changed, 399 insertions(+), 18 deletions(-)
create mode 100644 tools/testing/selftests/ptr_ring/Makefile
create mode 100644 tools/testing/selftests/ptr_ring/ptr_ring_test.c
create mode 100644 tools/testing/selftests/ptr_ring/ptr_ring_test.h

--
2.7.4

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