Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262615AbUCEO7M (ORCPT ); Fri, 5 Mar 2004 09:59:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262617AbUCEO7L (ORCPT ); Fri, 5 Mar 2004 09:59:11 -0500 Received: from ppp-217-133-42-200.cust-adsl.tiscali.it ([217.133.42.200]:32776 "EHLO dualathlon.random") by vger.kernel.org with ESMTP id S262615AbUCEO7I (ORCPT ); Fri, 5 Mar 2004 09:59:08 -0500 Date: Fri, 5 Mar 2004 15:59:47 +0100 From: Andrea Arcangeli To: Ingo Molnar Cc: Peter Zaitsev , Andrew Morton , riel@redhat.com, mbligh@aracnet.com, linux-kernel@vger.kernel.org Subject: Re: 2.4.23aa2 (bugfixes and important VM improvements for the high end) Message-ID: <20040305145947.GA4922@dualathlon.random> References: <20040228072926.GR8834@dualathlon.random> <20040229014357.GW8834@dualathlon.random> <1078370073.3403.759.camel@abyss.local> <20040303193343.52226603.akpm@osdl.org> <1078371876.3403.810.camel@abyss.local> <20040305103308.GA5092@elte.hu> <20040305141504.GY4922@dualathlon.random> <20040305143425.GA11604@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040305143425.GA11604@elte.hu> 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: 1250 Lines: 32 On Fri, Mar 05, 2004 at 03:34:25PM +0100, Ingo Molnar wrote: > > * Andrea Arcangeli wrote: > > > > vsyscall-sys_gettimeofday and vsyscall-sys_time could help quite some > ^^^^^^^^^^^^^^^^^ > > > for mysql. Also, the highly threaded nature of mysql on the same MM > > > > he said he doesn't use gettimeofday frequently, so most of the flushes > > are from other syscalls. > > you are not reading Pete's and my emails too carefully, are you? Pete > said: I thought time() wouldn't be called more than 1 per second anyways, why would anyone call time more than 1 per second? > > > [...] MySQL does not use gettimeofday very frequently now, actually it > > uses time() most of the time, as some platforms used to have huge > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > performance problems with gettimeofday() in the past. > > > > The amount of gettimeofday() use will increase dramatically in the > > future so it is good to know about this matter. > > Ingo - 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/