Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264194AbUDGWwC (ORCPT ); Wed, 7 Apr 2004 18:52:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264199AbUDGWwB (ORCPT ); Wed, 7 Apr 2004 18:52:01 -0400 Received: from ppp-217-133-42-200.cust-adsl.tiscali.it ([217.133.42.200]:21435 "EHLO dualathlon.random") by vger.kernel.org with ESMTP id S264194AbUDGWu7 (ORCPT ); Wed, 7 Apr 2004 18:50:59 -0400 Date: Thu, 8 Apr 2004 00:50:57 +0200 From: Andrea Arcangeli To: "Martin J. Bligh" Cc: Ingo Molnar , Eric Whiting , akpm@osdl.org, linux-kernel@vger.kernel.org, Pete Zaitcev Subject: Re: -mmX 4G patches feedback [numbers: how much performance impact] Message-ID: <20040407225057.GS26888@dualathlon.random> References: <40718B2A.967D9467@amis.com> <20040405174616.GH2234@dualathlon.random> <4071D11B.1FEFD20A@amis.com> <20040405221641.GN2234@dualathlon.random> <20040406115539.GA31465@elte.hu> <20040406155925.GW2234@dualathlon.random> <20040406172431.GA9185@elte.hu> <20040406175722.GE2234@dualathlon.random> <10680000.1081378467@flay> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <10680000.1081378467@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: 716 Lines: 13 On Wed, Apr 07, 2004 at 03:54:27PM -0700, Martin J. Bligh wrote: > Or was this another workload, where gettimeofday wasn't the problem? mysql is another common -30% slowdown where gettimeofday shouldn't be the problem. Any threaded application doing I/O should have major scalability problems with 4:4 regardless the tlb flushing frequency, the more cpus the biggest the hit (I should say mm_switch frequency [not tlb flush frequency] after my latest benchmark results) - 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/