Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964847AbWAIQUB (ORCPT ); Mon, 9 Jan 2006 11:20:01 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S964845AbWAIQUB (ORCPT ); Mon, 9 Jan 2006 11:20:01 -0500 Received: from mustang.oldcity.dca.net ([216.158.38.3]:16867 "HELO mustang.oldcity.dca.net") by vger.kernel.org with SMTP id S964847AbWAIQUA (ORCPT ); Mon, 9 Jan 2006 11:20:00 -0500 Subject: Re: Why the DOS has many ntfs read and write driver,but the linux can't for a long time From: Lee Revell To: Oliver Neukum Cc: Robert Hancock , linux-kernel In-Reply-To: <200601091714.27303.oliver@neukum.org> References: <5t06S-7nB-15@gated-at.bofh.it> <200601091702.48955.oliver@neukum.org> <1136822646.9957.35.camel@mindpipe> <200601091714.27303.oliver@neukum.org> Content-Type: text/plain Date: Mon, 09 Jan 2006 11:19:58 -0500 Message-Id: <1136823598.9957.43.camel@mindpipe> Mime-Version: 1.0 X-Mailer: Evolution 2.5.4 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1925 Lines: 41 On Mon, 2006-01-09 at 17:14 +0100, Oliver Neukum wrote: > Am Montag, 9. Januar 2006 17:04 schrieb Lee Revell: > > On Mon, 2006-01-09 at 17:02 +0100, Oliver Neukum wrote: > > > Am Montag, 9. Januar 2006 16:15 schrieb Lee Revell: > > > > On Mon, 2006-01-09 at 15:28 +0100, Oliver Neukum wrote: > > > > > Am Montag, 9. Januar 2006 15:18 schrieb Robert Hancock: > > > > > > Yaroslav Rastrigin wrote: > > > > > > > Well, I could find more or less reasonable explanation of this behaviour - different VM policies of two OSes and > > > > > > > strangely strong and persistent belief "Free RAM is a wasted RAM" among kernel devs. Free RAM is not a wasted RAM, its a memory waiting to be used ! > > > > > > > Whenever it is needed by apps I'm launching or working with. > > > > > > > > > > > > There is no different VM policy here, Windows behaves quite similarly. > > > > > > It does not leave memory around unused, it uses it for disk cache. > > > > > > > > > > That doesn't mean that the rate of eviction is the same. > > > > > Is it possible that read-ahead is not aggressive enough? > > > > > > > > Enough for what? What is the exact problem you are trying to solve? > > > > > > Quicker application startup. > > > > Why do you look to the kernel first? The obvious explanation is that > > Linux desktop apps are more bloated than their Windows counterparts. > > It is the most efficient place. An improvement to the kernel will improve > all starting times. I think you'll get at most a 10% or 20% speedup by improving the kernel, while some of these apps (think Nautilus vs Windows Explorer) will need to be 1000% faster to seem reasonable to a Windows user. Lee Lee - 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/