From: Andrew Morton <akpm@linux-foundation.org>
To: Alex Shi <alex.shi@intel.com>
Cc: rob@landley.net, mingo@redhat.com, peterz@infradead.org,
suresh.b.siddha@intel.com, arjan@linux.intel.com,
vincent.guittot@linaro.org, tglx@linutronix.de,
gregkh@linuxfoundation.org, andre.przywara@amd.com, rjw@sisk.pl,
paul.gortmaker@windriver.com, paulmck@linux.vnet.ibm.com,
linux-kernel@vger.kernel.org, cl@linux.com, pjt@google.com
Subject: Re: [RFC PATCH 2/3] sched: power aware load balance,
Date: Tue, 6 Nov 2012 11:51:05 -0800 [thread overview]
Message-ID: <20121106115105.4ba6ab32.akpm@linux-foundation.org> (raw)
In-Reply-To: <1352207399-29497-3-git-send-email-alex.shi@intel.com>
On Tue, 6 Nov 2012 21:09:58 +0800
Alex Shi <alex.shi@intel.com> wrote:
> $for ((i=0; i < I; i++)) ; do while true; do : ; done & done
>
> Checking the power consuming with a powermeter on the NHM EP.
> powersaving performance
> I = 2 148w 160w
> I = 4 175w 181w
> I = 8 207w 224w
> I = 16 324w 324w
>
> On a SNB laptop(4 cores *HT)
> powersaving performance
> I = 2 28w 35w
> I = 4 38w 52w
> I = 6 44w 54w
> I = 8 56w 56w
>
> On the SNB EP machine, when I = 16, power saved more than 100 Watts.
Confused. According to the above table, at I=16 the EP machine saved 0
watts. Typo in the data?
Also, that's a pretty narrow test - it's doing fork and exec at very
high frequency and things such as task placement decisions at process
startup might be affecting the results. Also, the load will be quite
kernel-intensive, as opposed to the more typical userspace-intensive
loads.
So, please run a broader set of tests so we can see the effects?
next prev parent reply other threads:[~2012-11-06 19:51 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-06 13:09 [RFC PATCH 0/3] power aware scheduling Alex Shi
2012-11-06 13:09 ` [RFC PATCH 1/3] sched: add sched_policy and it's sysfs interface Alex Shi
2012-11-06 13:48 ` Greg KH
2012-11-07 12:27 ` Alex Shi
2012-11-07 14:41 ` Greg KH
2012-11-08 14:40 ` Alex Shi
2012-11-06 15:20 ` Luming Yu
2012-11-07 13:03 ` Alex Shi
2012-11-06 13:09 ` [RFC PATCH 2/3] sched: power aware load balance, Alex Shi
2012-11-06 19:51 ` Andrew Morton [this message]
2012-11-07 12:42 ` Alex Shi
2012-11-07 4:37 ` Preeti Murthy
2012-11-07 13:27 ` Alex Shi
2012-11-11 18:49 ` Preeti Murthy
2012-11-12 3:05 ` Alex Shi
2012-11-06 13:09 ` [RFC PATCH 3/3] sched: add power aware scheduling in fork/exec/wake Alex Shi
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