From: Michael Neuling <mikey@neuling.org>
To: Diwakar Tundlam <dtundlam@nvidia.com>
cc: "'Peter Zijlstra'" <a.p.zijlstra@chello.nl>,
        "'Ingo Molnar'" <mingo@kernel.org>,
        "'Andrew Morton'" <akpm@linux-foundation.org>,
        "'Christoph Lameter'" <cl@gentwo.org>,
        "'Stephen Rothwell'" <sfr@canb.auug.org.au>,
        "'Benjamin Herrenschmidt'" <benh@kernel.crashing.org>,
        "'David Rientjes'" <rientjes@google.com>,
        "'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>,
        Peter De Schrijver <pdeschrijver@nvidia.com>
Subject: Re: [PATCH] sched: Enable arch-specific asym packing option in sched domain
In-reply-to: <1DD7BFEDD3147247B1355BEFEFE46652379C3DF102@HQMAIL04.nvidia.com>
References: <1DD7BFEDD3147247B1355BEFEFE46652379C3DF0FF@HQMAIL04.nvidia.com> <1DD7BFEDD3147247B1355BEFEFE46652379C3DF101@HQMAIL04.nvidia.com> <1336169422.16236.1.camel@twins> <1DD7BFEDD3147247B1355BEFEFE46652379C3DF102@HQMAIL04.nvidia.com>
Comments: In-reply-to Diwakar Tundlam <dtundlam@nvidia.com>
   message dated "Fri, 04 May 2012 15:18:04 -0700."
Date: Sat, 05 May 2012 08:51:58 +1000
Message-ID: <5722.1336171918@neuling.org>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 769
Lines: 19

> We need this for Tegra's slight asymmetry with core0.

This would seem to be to be a different problem.  I don't think the
packing mechanism is what you want.

Shouldn't you be increasing the CPU power of this core, so that all
tasks get a fair go on this core?  Otherwise you're breaking the
fundamental concept of a completely fair scheduler.

Using this packing mechanism you won't get this.  Any task that lands on
core 0 will get an unfair amount of computation power, compared to tasks
that landed on core 1.

Mikey
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