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SubjectRe: [Lse-tech] [PATCH] New dcache / inode hash tuning patch
It actually seems a fraction slower (see systimes for Kernbench-16,
for instance).

Kernbench-2: (make -j N vmlinux, where N = 2 x num_cpus)
Elapsed User System CPU
2.5.62-mjb3 43.92 557.65 94.12 1483.50
2.5.62-mjb3-andi 44.28 557.90 95.79 1475.67

Kernbench-16: (make -j N vmlinux, where N = 16 x num_cpus)
Elapsed User System CPU
2.5.62-mjb3 45.21 560.46 114.58 1492.67
2.5.62-mjb3-andi 45.39 561.29 117.73 1495.67

DISCLAIMER: SPEC(tm) and the benchmark name SDET(tm) are registered
trademarks of the Standard Performance Evaluation Corporation. This
benchmarking was performed for research purposes only, and the run results
are non-compliant and not-comparable with any published results.

Results are shown as percentages of the first set displayed

SDET 1 (see disclaimer)
Throughput Std. Dev
2.5.62-mjb3 100.0% 3.1%
2.5.62-mjb3-andi 101.8% 6.6%

SDET 2 (see disclaimer)
Throughput Std. Dev
2.5.62-mjb3 100.0% 4.0%
2.5.62-mjb3-andi 96.4% 4.8%

SDET 4 (see disclaimer)
Throughput Std. Dev
2.5.62-mjb3 100.0% 2.0%
2.5.62-mjb3-andi 100.4% 2.4%

SDET 8 (see disclaimer)
Throughput Std. Dev
2.5.62-mjb3 100.0% 4.6%
2.5.62-mjb3-andi 100.3% 2.3%

SDET 16 (see disclaimer)
Throughput Std. Dev
2.5.62-mjb3 100.0% 2.7%
2.5.62-mjb3-andi 96.6% 4.3%

SDET 32 (see disclaimer)
Throughput Std. Dev
2.5.62-mjb3 100.0% 0.9%
2.5.62-mjb3-andi 97.0% 2.1%

SDET 64 (see disclaimer)
Throughput Std. Dev
2.5.62-mjb3 100.0% 1.1%
2.5.62-mjb3-andi 100.2% 0.6%


Diffprofile (+ worse with your patch, - better)

500 3.1% total
138 6.9% .text.lock.file_table
103 2.2% default_idle
73 9.3% d_lookup
50 11.0% __copy_to_user_ll
45 27.4% file_move
40 28.2% path_lookup
...
-7 -3.9% do_schedule
-9 -2.0% get_empty_filp
-10 -8.6% dput
-10 -9.8% link_path_walk

That text.lock.file_table has been bugging me for a bit, and I need to
drill down into it some more.

M.

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