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SubjectRe: [LKP] [ftrace] fef5aeeee9e: -27.2% boot-slabinfo.num_objs
On Tue, 23 Dec 2014 11:10:17 +0800
Huang Ying <ying.huang@intel.com> wrote:

> FYI, we noticed the below changes on
>
> commit fef5aeeee9e3717e7aea991a7ae9ff6a7a2d4c85 ("ftrace: Replace tramp_hash with old_*_hash to save space")
>
>
> testbox/testcase/testparams: vm-kbuild-4G/boot/1
>
> e1effa0144a1ddf5 fef5aeeee9e3717e7aea991a7a
> ---------------- --------------------------
> %stddev %change %stddev
> \ | \
> 437752 ± 0% -27.2% 318545 ± 0% boot-slabinfo.num_objs
>
> vm-kbuild-4G: qemu-system-x86_64 -enable-kvm
> Memory: 4G

I have no idea what this test does. Is this good or bad? Is that -27.2%
a performance regression, or memory regression?

-- Steve


>
>
>
> boot-slabinfo.num_objs
>
> 440000 *+*--*-*-*------*----*-*-*--*--------*-*--*-*-*--*-----------------+
> | *.* *. *.*..* |
> 420000 ++ |
> | |
> 400000 ++ |
> | |
> 380000 ++ |
> | |
> 360000 ++ |
> | |
> 340000 ++ |
> | |
> 320000 O+O O O O O O O O O O O O O O O O O O O O O O O O O O
> | O O O |
> 300000 ++-----------------------------------------------------------------+
>
> [*] bisect-good sample
> [O] bisect-bad sample
>
> To reproduce:
>
> apt-get install ruby ruby-oj
> git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
> cd lkp-tests
> bin/setup-local job.yaml # the job file attached in this email
> bin/run-local job.yaml
>
>
> 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.
>
>
> Thanks,
> Huang, Ying
>



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