Subject: Re: [PATCH v12 00/31] Speculative page faults

From: Chinwen Chang <[email-masked]>
Date: Tue, 7 Jul 2020 13:31:37 +0800

On Mon, 2020-07-06 at 14:27 +0200, Laurent Dufour wrote:
> Le 06/07/2020 à 11:25, Chinwen Chang a écrit :
> > On Thu, 2019-06-20 at 16:19 +0800, Haiyan Song wrote:
> >> Hi Laurent,
> >>
> >> I downloaded your script and run it on Intel 2s skylake platform with spf-v12 patch
> >> serials.
> >>
> >> Here attached the output results of this script.
> >>
> >> The following comparison result is statistics from the script outputs.
> >>
> >> a). Enable THP
> >>                                              SPF_0          change       SPF_1
> >> will-it-scale.page_fault2.per_thread_ops    2664190.8      -11.7%       2353637.6
> >> will-it-scale.page_fault3.per_thread_ops    4480027.2      -14.7%       3819331.9
> >>
> >>
> >> b). Disable THP
> >>                                              SPF_0           change      SPF_1
> >> will-it-scale.page_fault2.per_thread_ops    2653260.7       -10%        2385165.8
> >> will-it-scale.page_fault3.per_thread_ops    4436330.1       -12.4%      3886734.2
> >>
> >>
> >> Thanks,
> >> Haiyan Song
> >>
> >>
> >> On Fri, Jun 14, 2019 at 10:44:47AM +0200, Laurent Dufour wrote:
> >>> Le 14/06/2019 à 10:37, Laurent Dufour a écrit :
> >>>> Please find attached the script I run to get these numbers.
> >>>> This would be nice if you could give it a try on your victim node and share the result.
> >>>
> >>> Sounds that the Intel mail fitering system doesn't like the attached shell script.
> >>> Please find it there: https://urldefense.com/v3/__https://gist.github.com/ldu4/a5cc1a93f293108ea387d43d5d5e7f44__;!!CTRNKA9wMg0ARbw!0lux2FMCbIFxFEl824CdSuSQqT0IVWsvyUqfDVJNEVb9gTWyRltm7cpPZg70N_XhXmMZ$ 
> >>>
> >>> Thanks,
> >>> Laurent.
> >>>
> > 
> > Hi Laurent,
> > 
> > We merged SPF v11 and some patches from v12 into our platforms. After
> > several experiments, we observed SPF has obvious improvements on the
> > launch time of applications, especially for those high-TLP ones,
> > 
> > # launch time of applications(s):
> > 
> > package           version      w/ SPF      w/o SPF      improve(%)
> > ------------------------------------------------------------------
> > Baidu maps        10.13.3      0.887       0.98         9.49
> > Taobao            8.4.0.35     1.227       1.293        5.10
> > Meituan           9.12.401     1.107       1.543        28.26
> > WeChat            7.0.3        2.353       2.68         12.20
> > Honor of Kings    1.43.1.6     6.63        6.713        1.24
> 
> That's great news, thanks for reporting this!
> 
> > 
> > By the way, we have verified our platforms with those patches and
> > achieved the goal of mass production.
> 
> Another good news!
> For my information, what is your targeted hardware?
> 
> Cheers,
> Laurent.

Hi Laurent,

Our targeted hardware belongs to ARM64 multi-core series.

Thanks.
Chinwen