Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751688Ab3CTU4R (ORCPT ); Wed, 20 Mar 2013 16:56:17 -0400 Received: from mail-ve0-f182.google.com ([209.85.128.182]:50186 "EHLO mail-ve0-f182.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750979Ab3CTU4O (ORCPT ); Wed, 20 Mar 2013 16:56:14 -0400 MIME-Version: 1.0 In-Reply-To: References: <1363809337-29718-1-git-send-email-riel@surriel.com> Date: Wed, 20 Mar 2013 13:56:12 -0700 X-Google-Sender-Auth: tbpa4CZsOPZvLfiZiVtTZzFEnOE Message-ID: Subject: Re: ipc,sem: sysv semaphore scalability From: Linus Torvalds To: Rik van Riel Cc: Davidlohr Bueso , Linux Kernel Mailing List , Andrew Morton , hhuang@redhat.com, "Low, Jason" , Michel Lespinasse , Larry Woodman , "Vinod, Chegu" 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: 1218 Lines: 28 On Wed, Mar 20, 2013 at 1:49 PM, Linus Torvalds wrote: > > It *would* be lovely to see this run with the actual Swingbench > numbers. The microbenchmark always looked much nicer. Do the > additional multi-semaphore scalability patches on top of Davidlohr's > patches help with the swingbench issue, or are we still totally > swamped by the ipc lock there? > > Maybe there were already numbers for that, but the last swingbench > numbers I can actually recall was from before the finer-grained > locking.. Ok, and if the spinlock is still a big deal even with the finer granularity, it might be interesting to hear if Michel's fast locks make a difference. I'm guessing that this series might actually make it easier/cleaner to do the semaphore locking using another lock, since the ipc_lock got split up and out... I think Michel did it for some socket code too. I think that was fairly independent and was for netperf. 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/