Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261925AbUDHXtF (ORCPT ); Thu, 8 Apr 2004 19:49:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262079AbUDHXtF (ORCPT ); Thu, 8 Apr 2004 19:49:05 -0400 Received: from ppp-217-133-42-200.cust-adsl.tiscali.it ([217.133.42.200]:46291 "EHLO dualathlon.random") by vger.kernel.org with ESMTP id S261925AbUDHXtC (ORCPT ); Thu, 8 Apr 2004 19:49:02 -0400 Date: Fri, 9 Apr 2004 01:49:01 +0200 From: Andrea Arcangeli To: "Martin J. Bligh" Cc: linux-kernel@vger.kernel.org Subject: Re: -mmX 4G patches feedback [numbers: how much performance impact] Message-ID: <20040408234901.GC31667@dualathlon.random> References: <20040407231806.GV26888@dualathlon.random> <33900000.1081380891@flay> <20040408001845.GX26888@dualathlon.random> <1479132704.1081405456@[10.10.2.4]> <20040408215946.GU31667@dualathlon.random> <29690000.1081462791@flay> <20040408221915.GV31667@dualathlon.random> <32730000.1081466048@flay> <20040408232215.GY31667@dualathlon.random> <39780000.1081467757@flay> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <39780000.1081467757@flay> User-Agent: Mutt/1.4.1i X-GPG-Key: 1024D/68B9CB43 13D9 8355 295F 4823 7C49 C012 DFA1 686E 68B9 CB43 X-PGP-Key: 1024R/CB4660B9 CC A0 71 81 F4 A0 63 AC C0 4B 81 1D 8C 15 C8 E5 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 889 Lines: 16 On Thu, Apr 08, 2004 at 04:42:37PM -0700, Martin J. Bligh wrote: > but still not perfect. Hmm. I'll go think about it ;-) nothing is perfect anyways ;), if you've an implementation it'd be very interesting to see a result in the kernel compile with -j with mem=800m, that should be close to a real life worst case. Then we'll see if the setup after execve is slowed down measurably, it's hard to tell, but we know there's a chance since you measure significant slowdown from pte-highmem on very highmem machines with short lived tasks. btw, note that if the task isn't short lived, good apps should flood with mmap either (at least on 64bit ;) - 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/