linux-kernel - Re: [fscrypt] 22d94f493b: will-it-scale.per_thread

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Message-ID: <20200309190939.GD1073@sol.localdomain>
Date:   Mon, 9 Mar 2020 12:09:39 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     kernel test robot <rong.a.chen@...el.com>
Cc:     Theodore Ts'o <tytso@....edu>, LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        lkp@...ts.01.org
Subject: Re: [fscrypt] 22d94f493b: will-it-scale.per_thread_ops 1.7%
 improvement

On Sun, Mar 08, 2020 at 10:02:41PM +0800, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed a 1.7% improvement of will-it-scale.per_thread_ops due to commit:
> 
> 
> commit: 22d94f493bfb408fdd764f7b1d0363af2122fba5 ("fscrypt: add FS_IOC_ADD_ENCRYPTION_KEY ioctl")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> 
> 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: 50%
> 	mode: thread
> 	test: poll2
> 	cpufreq_governor: performance
> 	ucode: 0x500002c
> 
> 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: https://github.com/antonblanchard/will-it-scale

This looks like a flaky test.  That commit shouldn't have had any effect on this
performance test, either positive or negative.

- Eric