linux-kernel - Re: Analysis of sched_mc_power

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Message-ID: <20080109122847.GA28955@dirshya.in.ibm.com>
Date:	Wed, 9 Jan 2008 17:58:47 +0530
From:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	discuss@...sWatts.org,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	venkatesh.pallipadi@...el.com, tglx@...utronix.de,
	Arjan van de Ven <arjan@...radead.org>,
	Gautham R Shenoy <ego@...ibm.com>,
	Chanda Sethia <chanda.sethia@...ibm.com>
Subject: Re: Analysis of sched_mc_power_savings

* Ingo Molnar <mingo@...e.hu> [2008-01-09 12:35:07]:

> 
> * Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com> wrote:
> 
> > How do we take this technique to the next step where we can 
> > consolidate short running jobs as well?  Did you face any difficulty 
> > biasing the CPU for short running jobs?
> 
> are you sure your measurement tasks do not impact the measurement 
> workload? If you use something like 'top' then try running it reniced to 
> +19. (or perhaps even bound to a particular CPU, say #3, to make its 
> impact isolated)

Hi Ingo,

I will watch this during the experiments.  I have been using klog
application to dump relayfs data.  I did run powertop and top as well,
I will bind them to certain CPUs and isolate their impact.

I believe the margin of error would be less since all the measurement
tasks sleep for long duration.

Thanks,
Vaidy

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