From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 29 Jan 2001 05:58:11 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 29 Jan 2001 05:58:01 -0500 Received: from zikova.cvut.cz ([147.32.235.100]:13842 "EHLO zikova.cvut.cz") by vger.kernel.org with ESMTP id convert rfc822-to-8bit; Mon, 29 Jan 2001 05:57:52 -0500 From: "Petr Vandrovec" Organization: CC CTU Prague To: Dieter Nuetzel Date: Mon, 29 Jan 2001 11:56:13 MET-1 MIME-Version: 1.0 Content-type: text/plain; charset=ISO-8859-2 Content-transfer-encoding: 8BIT Subject: Re: Linux-2.4.1-pre11 / ll_rw_b watermark metric? CC: Jens Axboe , Andrea Arcangeli , linux-kernel@vger.kernel.org, torvalds@transmeta.com X-mailer: Pegasus Mail v3.40 Message-ID: <13F3075C2004@vcnet.vc.cvut.cz> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 29 Jan 01 at 4:43, Dieter Nützel wrote: > I have pre11 running with Andrea's suggested fix. > > high_queued_sectors = total_ram / 3; > low_queued_sectors = high_queued_sectors / 2; > if (low_queued_sectors < 0) > low_queued_sectors = total_ram / 2; > I have one question: How it can happen that low_queued_sectors is less than zero with this changed logic? (And if it get triggered, low_queued_sectors will be greater than high_queued_sectors - which is not what we want...) But it is certainly better than 2.4.0-pre8 approach, as with 200MB of memory (exactly 192MB left unused) you can end up with low_queued_sectors == 0... And it does not give you optimal behavior. Best regards, Petr Vandrovec vandrove@vc.cvut.cz - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/