Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 9 Jan 2002 04:08:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 9 Jan 2002 04:08:14 -0500 Received: from hermine.idb.hist.no ([158.38.50.15]:22547 "HELO hermine.idb.hist.no") by vger.kernel.org with SMTP id ; Wed, 9 Jan 2002 04:08:09 -0500 Message-ID: <3C3C0870.DA5A5AB6@aitel.hist.no> Date: Wed, 09 Jan 2002 10:08:00 +0100 From: Helge Hafting X-Mailer: Mozilla 4.76 [no] (X11; U; Linux 2.5.2-pre10 i686) X-Accept-Language: en MIME-Version: 1.0 To: Andrew Morton CC: linux-kernel@vger.kernel.org Subject: Re: [2.4.17/18pre] VM and swap - it's really unusable In-Reply-To: <20020108173254.B9318@asooo.flowerfire.com> from "Ken Brownfield" at Jan 08, 2002 05:32:54 PM <3C3BD053.DED314A9@zip.com.au> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrew Morton wrote: [...] > I haven't seen any figures for embedded XP, but it is said that > if you bend over backwards you can get 10 milliseconds out of NT4, > and 4-5 out of the fabled BeOS. This is one area where we can > fairly easily be very much the best. It's low-hanging fruit. > > Internal preemptability is, in my opinion, the best way to deliver > this. > > I accept your point about it making debugging harder - I would > suggest that the preempt code be altered so that it can be disabled > at runtime, rather than via a rebuild. I suspect this can be > done at zero cost by setting init_task's preempt count to 1000000 > via a kernel boot option. And at almost-zero cost via a sysctl. And with some bad luck, the bug goes away when you do this. The bug of the missing lock... Helge Hafting - 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/