From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753258AbaETNF7 (ORCPT ); Tue, 20 May 2014 09:05:59 -0400 Received: from cantor2.suse.de ([195.135.220.15]:52329 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753110AbaETNF6 (ORCPT ); Tue, 20 May 2014 09:05:58 -0400 Date: Tue, 20 May 2014 15:05:56 +0200 From: Michal Hocko To: Rogier Wolff Cc: linux-kernel@vger.kernel.org Subject: Re: Buffer cache not working. Message-ID: <20140520130556.GA10945@dhcp22.suse.cz> References: <20140514144632.GB7404@bitwizard.nl> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20140514144632.GB7404@bitwizard.nl> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 14-05-14 16:46:32, Rogier Wolff wrote: [...] > Kernel: from Ubuntu 14.04, 3.13.0-19-generic The kernel is 64b right? > 32-bit userspace > 16Gb RAM installed. > Disks: 3x 3T in RAID5 > > ganglia shows the server memory graph as follows: > http://prive.bitwizard.nl/server_mem.png This shows that the memory usage didn't go over 5G. That is suspicious. Is this a NUMA machine? Is it possible that zone_reclaim_mode is enabled (cat /proc/sys/vm/zone_reclaim_mode)? > All other computers have a "nice" filled graph there. > > So, is there a bug in my kernel or am I missing an important tuning > parameter? > > > Roger. > > -- > ** R.E.Wolff@BitWizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 ** > ** Delftechpark 26 2628 XH Delft, The Netherlands. KVK: 27239233 ** > *-- BitWizard writes Linux device drivers for any device you may have! --* > The plan was simple, like my brother-in-law Phil. But unlike > Phil, this plan just might work. > -- > 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/ -- Michal Hocko SUSE Labs