Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755331AbaFTPip (ORCPT ); Fri, 20 Jun 2014 11:38:45 -0400 Received: from e38.co.us.ibm.com ([32.97.110.159]:48844 "EHLO e38.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753594AbaFTPio (ORCPT ); Fri, 20 Jun 2014 11:38:44 -0400 Date: Fri, 20 Jun 2014 08:38:39 -0700 From: "Paul E. McKenney" To: Christoph Lameter Cc: josh@joshtriplett.org, Andi Kleen , Dave Hansen , LKML , "Chen, Tim C" Subject: Re: [bisected] pre-3.16 regression on open() scalability Message-ID: <20140620153839.GB4904@linux.vnet.ibm.com> Reply-To: paulmck@linux.vnet.ibm.com References: <20140619014200.GO8178@tassilo.jf.intel.com> <20140619180916.GE4904@linux.vnet.ibm.com> <20140619204220.GJ4904@linux.vnet.ibm.com> <20140619213203.GA16747@cloud> <20140619230732.GX4904@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14062015-1344-0000-0000-00000252F101 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 20, 2014 at 10:20:36AM -0500, Christoph Lameter wrote: > On Thu, 19 Jun 2014, Paul E. McKenney wrote: > > > I am putting together patches based on Eric Dumazet's suggestion and on a > > variant of the above approach. However, I do expect the distros to starve > > to death between those two bales of hay. But perhaps the actual patches > > will inspire a bit of light to go with this thread's heat and smoke. > > Yep. Note that the large systems are only a few and the smaller systems > are many. You are penalizing the overwhelming majority for support of a > few systems. And the fraction of the small systems that care that much about latency is also quite small. Of course, if you have performance results that show otherwise, please share them. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/