linux-kernel - Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs unpinned

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Message-ID: <BANLkTi=7S2qdVjbJkDja+GAoD=pNo2gPsTFZMFkB8NWWkO1JVQ@mail.gmail.com>
Date:	Tue, 21 Jun 2011 12:48:17 -0700
From:	Paul Turner <pjt@...gle.com>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	Vladimir Davydov <vdavydov@...allels.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>,
	Dhaval Giani <dhaval.giani@...il.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Pavel Emelianov <xemul@...allels.com>
Subject: Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs unpinned

Hi Kamalesh,

Can you see what things look like under v7?

There's been a few improvements to quota re-distribution that should
hopefully help your test case.

The remaining idle% I see on my machines appear to be a product of
load-balancer inefficiency.

Thanks!

- Paul

On Tue, Jun 14, 2011 at 10:37 PM, Kamalesh Babulal
<kamalesh@...ux.vnet.ibm.com> wrote:
> * Paul Turner <pjt@...gle.com> [2011-06-13 17:00:08]:
>
>> Hi Kamalesh.
>>
>> I tried on both friday and again today to reproduce your results
>> without success.  Results are attached below.  The margin of error is
>> the same as the previous (2-level deep case), ~4%.  One minor nit, in
>> your script's input parsing you're calling shift; you don't need to do
>> this with getopts and it will actually lead to arguments being
>> dropped.
>>
>> Are you testing on top of a clean -tip?  Do you have any custom
>> load-balancer or scheduler settings?
>>
>> Thanks,
>>
>> - Paul
>>
>>
>> Hyper-threaded topology:
>> unpinned:
>> Average CPU Idle percentage 38.6333%
>> Bandwidth shared with remaining non-Idle 61.3667%
>>
>> pinned:
>> Average CPU Idle percentage 35.2766%
>> Bandwidth shared with remaining non-Idle 64.7234%
>> (The mask in the "unpinned" case is 0-3,6-9,12-15,18-21 which should
>> mirror your 2 socket 8x2 configuration.)
>>
>> 4-way NUMA topology:
>> unpinned:
>> Average CPU Idle percentage 5.26667%
>> Bandwidth shared with remaining non-Idle 94.73333%
>>
>> pinned:
>> Average CPU Idle percentage 0.242424%
>> Bandwidth shared with remaining non-Idle 99.757576%
>>
> Hi Paul,
>
> I tried tip 919c9baa9 + V6 patchset on 2 socket,quadcore with HT and
> the Idle time seen is ~22% to ~23%. Kernel is not tuned to any custom
> load-balancer/scheduler settings.
>
> unpinned:
> Average CPU Idle percentage 23.5333%
> Bandwidth shared with remaining non-Idle 76.4667%
>
> pinned:
> Average CPU Idle percentage 0%
> Bandwidth shared with remaining non-Idle 100%
>
> Thanks,
>
>  Kamalesh
>>
>>
>>
>> On Fri, Jun 10, 2011 at 11:17 AM, Kamalesh Babulal
>> <kamalesh@...ux.vnet.ibm.com> wrote:
>> > * Paul Turner <pjt@...gle.com> [2011-06-08 20:25:00]:
>> >
>> >> Hi Kamalesh,
>> >>
>> >> I'm unable to reproduce the results you describe.  One possibility is
>> >> load-balancer interaction -- can you describe the topology of the
>> >> platform you are running this on?
>> >>
>> >> On both a straight NUMA topology and a hyper-threaded platform I
>> >> observe a ~4% delta between the pinned and un-pinned cases.
>> >>
>> >> Thanks -- results below,
>> >>
>> >> - Paul
>> >>
>> >>
> (snip)
>
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