linux-kernel - Re: [patch 00/15] CFS Bandwidth Control V6

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Date:	Thu, 16 Jun 2011 17:45:08 +0800
From:	Hu Tao <hutao@...fujitsu.com>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	Paul Turner <pjt@...gle.com>, 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>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.co>
Subject: Re: [patch 00/15] CFS Bandwidth Control V6

On Thu, Jun 16, 2011 at 09:57:09AM +0900, Hidetoshi Seto wrote:
> (2011/06/15 17:37), Hu Tao wrote:
> > On Tue, Jun 14, 2011 at 04:29:49PM +0900, Hidetoshi Seto wrote:
> >> (2011/06/14 15:58), Hu Tao wrote:
> >>> Hi,
> >>>
> >>> I've run several tests including hackbench, unixbench, massive-intr
> >>> and kernel building. CPU is Intel(R) Xeon(R) CPU X3430  @ 2.40GHz,
> >>> 4 cores, and 4G memory.
> >>>
> >>> Most of the time the results differ few, but there are problems:
> >>>
> >>> 1. unixbench: execl throughout has about 5% drop.
> >>> 2. unixbench: process creation has about 5% drop.
> >>> 3. massive-intr: when running 200 processes for 5mins, the number
> >>>    of loops each process runs differ more than before cfs-bandwidth-v6.
> >>>
> >>> The results are attached.
> >>
> >> I know the score of unixbench is not so stable that the problem might
> >> be noises ... but the result of massive-intr is interesting.
> >> Could you give a try to find which piece (xx/15) in the series cause
> >> the problems?
> > 
> > After more tests, I found massive-intr data is not stable, too. Results
> > are attached. The third number in file name means which patchs are
> > applied, 0 means no patch applied. plot.sh is easy to generate png
> > files.
> 
> (Though I don't know what the 16th patch of this series is, anyway)

the 16th patch is this: https://lkml.org/lkml/2011/5/23/503

> I see that the results of 15, 15-1 and 15-2 are very different and that
> 15-2 is similar to without-patch.
> 
> One concern is whether this unstable of data is really caused by the
> nature of your test (hardware, massive-intr itself and something running
> in background etc.) or by a hidden piece in the bandwidth patch set.
> Did you see "not stable" data when none of patches is applied?

Yes. 

But for a five-runs the result seems 'stable'(before patches and after
patches). I've also run the tests in single mode. results are attached.

View attachment "massive-intr-200-300-0-1.txt" of type "text/plain" (3200 bytes)

View attachment "massive-intr-200-300-0-2.txt" of type "text/plain" (3008 bytes)

View attachment "massive-intr-200-300-0-3.txt" of type "text/plain" (3056 bytes)

View attachment "massive-intr-200-300-0-4.txt" of type "text/plain" (3168 bytes)

View attachment "massive-intr-200-300-0-5.txt" of type "text/plain" (2848 bytes)

View attachment "massive-intr-200-300-16-1.txt" of type "text/plain" (3024 bytes)

View attachment "massive-intr-200-300-16-2.txt" of type "text/plain" (3184 bytes)

View attachment "massive-intr-200-300-16-3.txt" of type "text/plain" (2992 bytes)

View attachment "massive-intr-200-300-16-4.txt" of type "text/plain" (3024 bytes)

View attachment "massive-intr-200-300-16-5.txt" of type "text/plain" (3200 bytes)

View attachment "massive-intr-200-300-single-0-1.txt" of type "text/plain" (3104 bytes)

View attachment "massive-intr-200-300-single-0-2.txt" of type "text/plain" (3184 bytes)

View attachment "massive-intr-200-300-single-0-3.txt" of type "text/plain" (2928 bytes)

View attachment "massive-intr-200-300-single-0-4.txt" of type "text/plain" (3184 bytes)

View attachment "massive-intr-200-300-single-0-5.txt" of type "text/plain" (3152 bytes)

View attachment "massive-intr-200-300-single-16-1.txt" of type "text/plain" (3088 bytes)

View attachment "massive-intr-200-300-single-16-2.txt" of type "text/plain" (3072 bytes)

View attachment "massive-intr-200-300-single-16-3.txt" of type "text/plain" (3200 bytes)

View attachment "massive-intr-200-300-single-16-4.txt" of type "text/plain" (3104 bytes)

View attachment "massive-intr-200-300-single-16-5.txt" of type "text/plain" (3120 bytes)

Download attachment "0-1.png" of type "image/png" (12388 bytes)

Download attachment "16-1.png" of type "image/png" (12546 bytes)

Download attachment "single-0-1.png" of type "image/png" (10008 bytes)

Download attachment "single-16-1.png" of type "image/png" (11114 bytes)