From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id DB2117F3F for ; Wed, 4 Mar 2015 17:35:54 -0600 (CST) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay1.corp.sgi.com (Postfix) with ESMTP id C8AC78F8054 for ; Wed, 4 Mar 2015 15:35:51 -0800 (PST) Received: from mail-we0-f177.google.com (mail-we0-f177.google.com [74.125.82.177]) by cuda.sgi.com with ESMTP id vm8fsWPt7Uwmjxzq (version=TLSv1 cipher=RC4-SHA bits=128 verify=NO) for ; Wed, 04 Mar 2015 15:35:49 -0800 (PST) Received: by wesq59 with SMTP id q59so12608585wes.3 for ; Wed, 04 Mar 2015 15:35:48 -0800 (PST) Date: Thu, 5 Mar 2015 00:35:45 +0100 From: Ingo Molnar Subject: Re: [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation. Message-ID: <20150304233544.GA24733@gmail.com> References: <20150303014733.GL18360@dastard> <20150303052004.GM18360@dastard> <20150303113437.GR4251@dastard> <20150303134346.GO3087@suse.de> <20150303213353.GS4251@dastard> <20150304200046.GP3087@suse.de> <20150304230045.GZ18360@dastard> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20150304230045.GZ18360@dastard> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Dave Chinner Cc: Matt B , Linux Kernel Mailing List , xfs@oss.sgi.com, linux-mm , Mel Gorman , Andrew Morton , Linus Torvalds * Dave Chinner wrote: > > After going through the series again, I did not spot why there is > > a difference. It's functionally similar and I would hate the > > theory that this is somehow hardware related due to the use of > > bits it takes action on. > > I doubt it's hardware related - I'm testing inside a VM, [...] That might be significant, I doubt Mel considered KVM's interpretation of pte details? Thanks, Ingo _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f173.google.com (mail-wi0-f173.google.com [209.85.212.173]) by kanga.kvack.org (Postfix) with ESMTP id A8FE66B0038 for ; Wed, 4 Mar 2015 18:35:50 -0500 (EST) Received: by widex7 with SMTP id ex7so32459199wid.1 for ; Wed, 04 Mar 2015 15:35:50 -0800 (PST) Received: from mail-wg0-x236.google.com (mail-wg0-x236.google.com. [2a00:1450:400c:c00::236]) by mx.google.com with ESMTPS id eq4si9484184wjd.112.2015.03.04.15.35.48 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 04 Mar 2015 15:35:49 -0800 (PST) Received: by wggx13 with SMTP id x13so9778032wgg.4 for ; Wed, 04 Mar 2015 15:35:48 -0800 (PST) Date: Thu, 5 Mar 2015 00:35:45 +0100 From: Ingo Molnar Subject: Re: [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation. Message-ID: <20150304233544.GA24733@gmail.com> References: <20150303014733.GL18360@dastard> <20150303052004.GM18360@dastard> <20150303113437.GR4251@dastard> <20150303134346.GO3087@suse.de> <20150303213353.GS4251@dastard> <20150304200046.GP3087@suse.de> <20150304230045.GZ18360@dastard> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150304230045.GZ18360@dastard> Sender: owner-linux-mm@kvack.org List-ID: To: Dave Chinner Cc: Mel Gorman , Linus Torvalds , Andrew Morton , Matt B , Linux Kernel Mailing List , linux-mm , xfs@oss.sgi.com * Dave Chinner wrote: > > After going through the series again, I did not spot why there is > > a difference. It's functionally similar and I would hate the > > theory that this is somehow hardware related due to the use of > > bits it takes action on. > > I doubt it's hardware related - I'm testing inside a VM, [...] That might be significant, I doubt Mel considered KVM's interpretation of pte details? Thanks, Ingo -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752093AbbCDXfv (ORCPT ); Wed, 4 Mar 2015 18:35:51 -0500 Received: from mail-wg0-f44.google.com ([74.125.82.44]:46784 "EHLO mail-wg0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750991AbbCDXfu (ORCPT ); Wed, 4 Mar 2015 18:35:50 -0500 Date: Thu, 5 Mar 2015 00:35:45 +0100 From: Ingo Molnar To: Dave Chinner Cc: Mel Gorman , Linus Torvalds , Andrew Morton , Matt B , Linux Kernel Mailing List , linux-mm , xfs@oss.sgi.com Subject: Re: [regression v4.0-rc1] mm: IPIs from TLB flushes causing significant performance degradation. Message-ID: <20150304233544.GA24733@gmail.com> References: <20150303014733.GL18360@dastard> <20150303052004.GM18360@dastard> <20150303113437.GR4251@dastard> <20150303134346.GO3087@suse.de> <20150303213353.GS4251@dastard> <20150304200046.GP3087@suse.de> <20150304230045.GZ18360@dastard> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150304230045.GZ18360@dastard> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Dave Chinner wrote: > > After going through the series again, I did not spot why there is > > a difference. It's functionally similar and I would hate the > > theory that this is somehow hardware related due to the use of > > bits it takes action on. > > I doubt it's hardware related - I'm testing inside a VM, [...] That might be significant, I doubt Mel considered KVM's interpretation of pte details? Thanks, Ingo