Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 2 Feb 2002 09:53:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 2 Feb 2002 09:53:10 -0500 Received: from mustard.heime.net ([194.234.65.222]:14252 "EHLO mustard.heime.net") by vger.kernel.org with ESMTP id ; Sat, 2 Feb 2002 09:53:04 -0500 Date: Sat, 2 Feb 2002 15:52:53 +0100 (CET) From: Roy Sigurd Karlsbakk To: Jens Axboe cc: Roger Larsson , Andrew Morton , Subject: Re: Errors in the VM - detailed In-Reply-To: <20020201195743.J12156@suse.de> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > > Hmm.. suppose this is the problem anyway and that Jens patch was not enough. > > How do the disk drive sound during the test? > > > > Does it start to sound more when performance goes down? > > Yes that would be interesting to know, if the disk becomes seek bound. The performance never goes down. It's stable @ ~40-43 MB/s. It DID go down, but that was before -rmap11c. Then the problem was in the VM > Probably, my patch was really just a quick try to see if it changed > anything. > > > Number of READ limits the number of concurrent streams. > > And READA limits the maximum total read ahead. > > Correct, Roy you could try and change the READA balance by allocating > lots more READA requests. Simply play around with the > queue_nr_requests / 4 setting. Try something "absurd" like > queue_nr_requests << 2 or even bigger. sure. where do I change this??? -- Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA Computers are like air conditioners. They stop working when you open Windows. - 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/