Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932797Ab3CVBXj (ORCPT ); Thu, 21 Mar 2013 21:23:39 -0400 Received: from mail-vc0-f174.google.com ([209.85.220.174]:61246 "EHLO mail-vc0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753305Ab3CVBXh (ORCPT ); Thu, 21 Mar 2013 21:23:37 -0400 MIME-Version: 1.0 In-Reply-To: <1363914773.31240.58.camel@buesod1.americas.hpqcorp.net> References: <1363809337-29718-1-git-send-email-riel@surriel.com> <1363914773.31240.58.camel@buesod1.americas.hpqcorp.net> Date: Thu, 21 Mar 2013 18:23:37 -0700 X-Google-Sender-Auth: HnhnmWW4CM_bHId5PCy1eI8_BPY Message-ID: Subject: Re: ipc,sem: sysv semaphore scalability From: Linus Torvalds To: Davidlohr Bueso Cc: Rik van Riel , Andrew Morton , hhuang@redhat.com, "Low, Jason" , Michel Lespinasse , Larry Woodman , "Vinod, Chegu" , Linux Kernel Mailing List Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1121 Lines: 25 On Thu, Mar 21, 2013 at 6:12 PM, Davidlohr Bueso wrote: > > ipc lock contention: > 100 users: 8,74% (vanilla) 3.17% (v3 patchset) > 400 users: 21,86% (vanilla) 5.23% (v3 patchset) > 800 users 84,35% (vanilla) 7.39% (v3 patchset) Ok, I'd call that pretty much "solved". Sure, it's still visible, but for being a benchmark that apparently does little else than pound on those sysv semaphores, I think we can consider it pretty much fine. I'm going to assume that anybody who actually then does any real work (ie a database) is never going to see even close to this bad contention. Good job, Rik. I'm assuming we'll be merging this during the 3.10 merge window, and hopefully the merge conflicts will be sorted out too. Rik, Peter, can you look at each others patches and see if you can get that sorted out for Andrew? Linus -- 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/