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SubjectRe: [bpf] af7ec13833: will-it-scale.per_process_ops -2.5% regression

On 6/28/20 1:50 AM, kernel test robot wrote:
> Greeting,
> FYI, we noticed a -2.5% regression of will-it-scale.per_process_ops due to commit:
> commit: af7ec13833619e17f03aa73a785a2f871da6d66b ("bpf: Add bpf_skc_to_tcp6_sock() helper")
> master

One of previous emails claims that
commit: 492e639f0c222784e2e0f121966375f641c61b15 ("bpf: Add
bpf_seq_printf and bpf_seq_write helpers")
is reponsible for 2.5% improvement for will-it-scale.per_process_ops,
which I believe is false.

This commit should not cause regression.

Probably the variation of performance is caused by test environment
which you may want to investigate further to reduce false alarming.

> in testcase: will-it-scale
> on test machine: 192 threads Intel(R) Xeon(R) Platinum 9242 CPU @ 2.30GHz with 192G memory
> with following parameters:
> nr_task: 16
> mode: process
> test: mmap1
> cpufreq_governor: performance
> ucode: 0x5002f01
> test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two.
> test-url:
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <>
> Details are as below:

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