Greeting,

We noticed a -11.6% regression of aim7.jobs-per-min due to commit:

commit 012bc68ee96faf7b8d245edc270723544574bb11 ("fs: always set I_DIRTY_TIME to fsync correctly on lazytime")
https://github.com/0day-ci/linux Naohiro-Aota/fs-always-set-I_DIRTY_TIME-to-fsync-correctly-on-lazytime/20161101-032629

in testcase: aim7
on test machine: 40 threads Intel(R) Xeon(R) CPU E5-2690 v2 @ 3.00GHz with 384G memory
with following parameters:

	disk: 1BRD_48G
	fs: f2fs
	test: sync_disk_rw
	load: 600
	cpufreq_governor: performance

AIM7 is a traditional UNIX system level benchmark suite which is used to test and measure the performance of multiuser system.



Disclaimer:
Results have been estimated based on internal Intel analysis and are provided
for informational purposes only. Any difference in system hardware or software
design or configuration may affect actual performance.

Details are as below:
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To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Xiaolong