Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262320AbUJ0IbB (ORCPT ); Wed, 27 Oct 2004 04:31:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262333AbUJ0IbB (ORCPT ); Wed, 27 Oct 2004 04:31:01 -0400 Received: from ore.jhcloos.com ([64.240.156.239]:63498 "EHLO ore.jhcloos.com") by vger.kernel.org with ESMTP id S262320AbUJ0Ia4 (ORCPT ); Wed, 27 Oct 2004 04:30:56 -0400 To: linux-kernel@vger.kernel.org Cc: david@gibson.dropbear.id.au, Andrew Morton Subject: Re: MAP_SHARED bizarrely slow From: James Cloos In-Reply-To: <20041027010659.15ec7e90.akpm@osdl.org> (Andrew Morton's message of "Wed, 27 Oct 2004 01:06:59 -0700") References: <20041027064527.GJ1676@zax> <20041027010659.15ec7e90.akpm@osdl.org> X-Hashcash: 0:041027:linux-kernel@vger.kernel.org:fa444bdbf344a379 X-Hashcash: 0:041027:david@gibson.dropbear.id.au:9d26422dbb5e3052 X-Hashcash: 0:041027:akpm@osdl.org:eaf128b3f3c437d0 Date: Wed, 27 Oct 2004 01:30:10 -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: 731 Lines: 13 >>>>> "Andrew" == Andrew Morton writes: JimC> Both took about 11 seconds for the private and around 30 seconds JimC> for the shared tests. Andrew> I get the exact opposite, on a P4: Interesting. I gave it a try on a couple of my UMLs. One is on a P4 (possibly xeon; not sure) and the other is on an athlon. The p4 did shared about twice as fast as private and the athlon was 50% faster. (p4 uses uml kernel 2.4.27; athlon 2.6.6; no idea what the hosts run.) -JimC - 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/