Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261529AbUJ0HXd (ORCPT ); Wed, 27 Oct 2004 03:23:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262316AbUJ0HXd (ORCPT ); Wed, 27 Oct 2004 03:23:33 -0400 Received: from ore.jhcloos.com ([64.240.156.239]:61962 "EHLO ore.jhcloos.com") by vger.kernel.org with ESMTP id S261529AbUJ0HX1 (ORCPT ); Wed, 27 Oct 2004 03:23:27 -0400 To: linux-kernel@vger.kernel.org Cc: David Gibson Subject: Re: MAP_SHARED bizarrely slow From: James Cloos In-Reply-To: <20041027064527.GJ1676@zax> (David Gibson's message of "Wed, 27 Oct 2004 16:45:27 +1000") References: <20041027064527.GJ1676@zax> X-Hashcash: 0:041027:linux-kernel@vger.kernel.org:017a53f9603beaa8 X-Hashcash: 0:041027:david@gibson.dropbear.id.au:00339d805705f9da Date: Wed, 27 Oct 2004 00:23:00 -0700 Message-ID: User-Agent: Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3.50 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 996 Lines: 23 >>>>> "David" == David Gibson writes: David> http://www.ozlabs.org/people/dgibson/maptest.tar.gz David> On a number of machines I've tested - both ppc64 and x86 - the David> SHARED version is consistently and significantly (50-100%) David> slower than the PRIVATE version. Just gave it a test on my laptop and server. Both are p3. The laptop is under heavier mem pressure; the server has just under a gig with most free/cache/buff. Laptop is still running 2.6.7 whereas the server is bk as of 2004-10-24. Buth took about 11 seconds for the private and around 30 seconds for the shared tests. So if this is a regression, it predates v2.6.7. -JimC -- James H. Cloos, Jr. - 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/