Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 21 Jan 2002 16:20:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 21 Jan 2002 16:20:13 -0500 Received: from zero.tech9.net ([209.61.188.187]:4881 "EHLO zero.tech9.net") by vger.kernel.org with ESMTP id ; Mon, 21 Jan 2002 16:19:58 -0500 Subject: Re: [2.4.17/18pre] VM and swap - it's really unusable From: Robert Love To: Daniel Phillips Cc: yodaiken@fsmlabs.com, george anzinger , Momchil Velikov , Arjan van de Ven , Roman Zippel , linux-kernel@vger.kernel.org In-Reply-To: In-Reply-To: <20020121090602.A13715@hq.fsmlabs.com> Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Evolution/1.0.1 Date: 21 Jan 2002 16:24:07 -0500 Message-Id: <1011648248.988.475.camel@phantasy> Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2002-01-21 at 11:48, Daniel Phillips wrote: > The disk and the IO thread are active a higher portion of the time, while the > kernel hog gets the same amount of time. So in this case we have improved > both latency and throughput. > > Naturally I constructed this case to show the effect most clearly. There are > many possible variations on the above scenario. It does seem to explain the > latency/throughput improvements that have been reported in practice. Well put. I think this is exact the scenario we are observing. Its the same benefit to latency. We react quicker. Robert Love - 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/