From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner+w=401wt.eu-S1751179AbZIOEPH@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1751179AbZIOEPH (ORCPT <rfc822;w@1wt.eu>);
	Tue, 15 Sep 2009 00:15:07 -0400
Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750975AbZIOEPF
	(ORCPT <rfc822;linux-kernel-outgoing>);
	Tue, 15 Sep 2009 00:15:05 -0400
Received: from casper.infradead.org ([85.118.1.10]:48618 "EHLO
	casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750945AbZIOEPE (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 15 Sep 2009 00:15:04 -0400
Date: Tue, 15 Sep 2009 06:18:44 +0200
From: Arjan van de Ven <arjan@infradead.org>
To: Arjan van de Ven <arjan@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, linux-kernel@vger.kernel.org,
       lenb@kernel.org, mingo@elte.hu, yanmin_zhang@linux.intel.com,
       jens.axboe@oracle.com, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Subject: Re: [PATCH v2] cpuidle: Fix the menu governor to boost IO
 performance
Message-ID: <20090915061844.3c92ee7a@infradead.org>
In-Reply-To: <20090915061512.0209d956@infradead.org>
References: <20090915054259.5282e5ba@infradead.org>
	<20090914205408.578f7f60.akpm@linux-foundation.org>
	<20090915061512.0209d956@infradead.org>
Organization: Intel
X-Mailer: Claws Mail 3.7.2 (GTK+ 2.14.7; i386-redhat-linux-gnu)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
X-SRS-Rewrite: SMTP reverse-path rewritten from <arjan@infradead.org> by casper.infradead.org
	See http://www.infradead.org/rpr.html
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, 15 Sep 2009 06:15:12 +0200
Arjan van de Ven <arjan@infradead.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.