From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935259AbcCJJRa (ORCPT ); Thu, 10 Mar 2016 04:17:30 -0500 Received: from casper.infradead.org ([85.118.1.10]:56975 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934335AbcCJJRU (ORCPT ); Thu, 10 Mar 2016 04:17:20 -0500 Date: Thu, 10 Mar 2016 10:17:16 +0100 From: Peter Zijlstra To: Davidlohr Bueso Cc: mingo@kernel.org, dave@stgolabs.net, linux-kernel@vger.kernel.org Subject: Re: [PATCH -tip 0/2] kernel/smp: Small csd_lock optimizations Message-ID: <20160310091716.GR6344@twins.programming.kicks-ass.net> References: <1457574936-19065-1-git-send-email-dbueso@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1457574936-19065-1-git-send-email-dbueso@suse.de> User-Agent: Mutt/1.5.21 (2012-12-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 09, 2016 at 05:55:34PM -0800, Davidlohr Bueso wrote: > From: Davidlohr Bueso > > Hi, > > Justifications are in each patch, there is slight impact (patch 2) > on some tlb flushing intensive benchmarks (albeit using ipi batching > nowadays). Specifically for the pft > benchmark, on a 12-core box: > 4.4 4.4 > vanilla smp > User 11.91 11.85 > System 197.11 194.69 > Elapsed 44.24 40.26 > > While the single thread is an abnormality, overall we don't seem > to do any harm (noise range). Could be give or take, but overall > the patches at least make some sense afaict. Acked-by: Peter Zijlstra (Intel)