linux-kernel - Re: [PATCH v1 00/19] Increase resolution of load weights

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Date:	Wed, 4 May 2011 13:13:55 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Nikhil Rao <ncrao@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org,
	"Nikunj A. Dadhania" <nikunj@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Stephan Barwolf <stephan.baerwolf@...ilmenau.de>
Subject: Re: [PATCH v1 00/19] Increase resolution of load weights

* Nikhil Rao <ncrao@...gle.com> wrote:

> Also, out of curiosity, what's an acceptable tolerance level for a 
> performance hit on 32-bit?

It's a cost/benefit analysis and for 32-bit systems the benefits seem to be 
rather small, right?

Can we make the increase in resolution dependent on max CPU count or such and 
use cheaper divides on 32-bit in that case, while still keeping the code clean? 

We'd expect only relatively large and new (and 64-bit) systems to run into 
resolution problems, right?

Thanks,

	Ingo
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