On Tue, Dec 11, 2018 at 05:14:29PM +0800, kernel test robot wrote: > FYI, we noticed a 21.9% improvement of stress-ng.eventfd.ops due to commit:
So, doesn't sound like a problem, but just looking into it out of curiosity..... I love that you do this, but these reports can be hard to figure out sometimes. The graphs especially could use better labeling. > commit: fd7732e033e30b3a586923b57e338c859e17858a ("fs/locks: create a tree of > dependent requests.") > https://git.kernel.org/cgit/linux/kernel/git/jlayton/linux.git locks-next > > in testcase: stress-ng > on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with > 64G memory > with following parameters: > > nr_threads: 100% > disk: 1HDD > testtime: 1s > class: filesystem > ucode: 0xb00002e > cpufreq_governor: performance Looking at the man page for stress-ng, it doesn't say much about what it actually does. It does say not to use stress-ng as a benchmark. I can't tell if it does file locking--the man pages does document some options which ask for locking (--flock, --locka, --lockf) but I don't see any evidence in the yaml file or elsewhere that those options are in use? These graphs could really use units on the axes. Also: > stress-ng.fcntl.ops > > > > 120000 +-+----------------------------------------------------------------+ > > O O O O O O O O O O O O O O O O O O | > > 110000 +-O O O O O O O | > > 100000 +-+ | > > | | > > 90000 +-+ | > > 80000 +-+ | > > | | > > 70000 +-+ | > > 60000 +-+ | > > | | > > 50000 +-+ | > > 40000 +-+ | > > |. .+.+..+.+. .+.+..+.+. .+.+.+..+. .+. .+.. .+. .+. .+.| > > 30000 +-+----------------------------------------------------------------+ > > > > > > > stress-ng.fcntl.ops_per_sec > > > > 120000 +-+----------------------------------------------------------------+ > > O O O O O O O O O O O O O O O O O O | > > 110000 +-O O O O O O O | > > 100000 +-+ | > > | | > > 90000 +-+ | > > 80000 +-+ | > > | | > > 70000 +-+ | > > 60000 +-+ | > > | | > > 50000 +-+ | > > 40000 +-+ | > > |. .+.+..+.+. .+.+..+.+. .+.+.+..+. .+. .+.. .+. .+. .+.| > > 30000 +-+----------------------------------------------------------------+ > > > > > > [*] bisect-good sample > [O] bisect-bad sample I see O's, not but any *'s. And what are the +'s? --b.