linux-kernel - Re: [PATCH v2] cpuidle: Fix the menu governor to boost IO performance

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Date:	Tue, 15 Sep 2009 06:18:44 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, lenb@...nel.org, mingo@...e.hu,
	yanmin_zhang@...ux.intel.com, jens.axboe@...cle.com,
	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Subject: Re: [PATCH v2] cpuidle: Fix the menu governor to boost IO
 performance

On Tue, 15 Sep 2009 06:15:12 +0200
Arjan van de Ven <arjan@...radead.org> wrote:
> 
> > The timing is awkward.  We could let it sit in Len's tree and
> > linux-next for a couple of months or we could say what-the-hell and
> > merge it.
> 
> If the performance impact wasn't this huge I'd say "let it sit".
> As it is now, with a nearly 2x performance delta, I'd not be very
> happy to expose linux users to this regression-like performance drop
> for another 3 months. 
>

btw I do not like to use the "regression" word lightly, but kernels
prior to 2.6.22 or so did not have this performance drop (at least not
nearly as much), and current ones do. 

 
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