From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265222AbUGZLsC (ORCPT ); Mon, 26 Jul 2004 07:48:02 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265229AbUGZLsC (ORCPT ); Mon, 26 Jul 2004 07:48:02 -0400 Received: from smtp014.mail.yahoo.com ([216.136.173.58]:55167 "HELO smtp014.mail.yahoo.com") by vger.kernel.org with SMTP id S265222AbUGZLrt (ORCPT ); Mon, 26 Jul 2004 07:47:49 -0400 Message-ID: <4104EF5F.9070405@yahoo.com.au> Date: Mon, 26 Jul 2004 21:47:43 +1000 From: Nick Piggin User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7) Gecko/20040707 Debian/1.7-5 X-Accept-Language: en MIME-Version: 1.0 To: Con Kolivas CC: "R. J. Wysocki" , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: Autotune swappiness01 References: <200407261234.29565.rjwysocki@sisk.pl> <4104DD27.6050907@kolivas.org> <200407261254.01186.rjwysocki@sisk.pl> <4104E4ED.7030901@kolivas.org> <4104E750.60400@yahoo.com.au> <4104E863.6070102@kolivas.org> In-Reply-To: <4104E863.6070102@kolivas.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Con Kolivas wrote: > Nick Piggin wrote: > >> Con Kolivas wrote: >>> In my ideal, nonsensical, impossible to obtain world we have an >>> autoregulating operating system that doesn't need any knobs. >>> >> >> Some thinks are fundamental tradeoffs that can't be autotuned. >> >> Latency vs throughput comes up in a lot of places, eg. timeslices. >> >> Maximum throughput via effective use of swap, versus swapping as >> a last resort may be another. > > > As I said... it was ideal, nonsensical, and impossible. Doesn't sound > like you're arguing with me. No, you're right. My ideal operating system knows what the user wants too ;) Most of the time though, you are right. The quality/desirability of an implementation will be inversely proportional to the number of knobs sticking out of it (with bonus points for those that are meaningful to 2 people on the planet). And yes, I think one knob should be enough for swapping behaviour too.