From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754461AbaE1IQu (ORCPT ); Wed, 28 May 2014 04:16:50 -0400 Received: from mail-we0-f180.google.com ([74.125.82.180]:58704 "EHLO mail-we0-f180.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750931AbaE1IQs (ORCPT ); Wed, 28 May 2014 04:16:48 -0400 Message-ID: <1401265004.9793.19.camel@marge.simpson.net> Subject: Re: balance storm From: Mike Galbraith To: Libo Chen Cc: tglx@linutronix.de, mingo@elte.hu, LKML , Greg KH , Li Zefan , peterz@infradead.org, Huang Qiang Date: Wed, 28 May 2014 10:16:44 +0200 In-Reply-To: <5385881D.4090601@huawei.com> References: <5382AF2E.1040407@huawei.com> <1401081082.5339.41.camel@marge.simpson.net> <538330B7.5070503@huawei.com> <1401113960.23186.41.camel@marge.simpson.net> <53844510.1040502@huawei.com> <1401184553.5134.115.camel@marge.simpson.net> <53848A2C.5010209@huawei.com> <1401196807.5134.132.camel@marge.simpson.net> <53853604.50500@huawei.com> <1401242038.4721.14.camel@marge.simpson.net> <5385881D.4090601@huawei.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.2.3 Content-Transfer-Encoding: 7bit Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2014-05-28 at 14:54 +0800, Libo Chen wrote: > On 2014/5/28 9:53, Mike Galbraith wrote: > > On Wed, 2014-05-28 at 09:04 +0800, Libo Chen wrote: > > > >> oh yes, no tsc only hpet in my box. > > > > Making poor E5-2658 box a crippled wreck. > > yes,it is. But cpu usage will be down from 15% to 5% when binding cpu, so maybe read_hpet > is not the root cause. I don't think anyone will be particularly interested in making kernel changes based upon the behavior of a broken box. The problem we were discussing is real enough though, it's just a question of severity. -Mike