From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f72.google.com (mail-wm0-f72.google.com [74.125.82.72]) by kanga.kvack.org (Postfix) with ESMTP id 8ED1F6B05CF for ; Wed, 2 Aug 2017 08:29:04 -0400 (EDT) Received: by mail-wm0-f72.google.com with SMTP id y206so5637100wmd.1 for ; Wed, 02 Aug 2017 05:29:04 -0700 (PDT) Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id h37si4091945wrh.133.2017.08.02.05.29.03 for (version=TLS1 cipher=AES128-SHA bits=128/128); Wed, 02 Aug 2017 05:29:03 -0700 (PDT) Date: Wed, 2 Aug 2017 14:29:01 +0200 From: Michal Hocko Subject: Re: [BUG] Slow SATA disk - waiting in balance_dirty_pages() on i686-pae.html Message-ID: <20170802122901.GB2529@dhcp22.suse.cz> References: <2a526c85-0e27-7a5d-f606-66c74499352a@univention.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2a526c85-0e27-7a5d-f606-66c74499352a@univention.de> Sender: owner-linux-mm@kvack.org List-ID: To: Philipp Hahn Cc: linux-mm@kvack.org, "linux-kernel@vger.kernel.org" On Tue 01-08-17 12:32:40, Philipp Hahn wrote: > Hello, > > ;TL,DR: apt-get is blocked by balance_dirty_pages() with linux-{3,16 > 4.2, 4.9}, but fast after reboot. > > > We still have several systems running 4.9.0-ucs104-686-pae. They have 16 > GiB RAM and two disk: I would strongly discourage you from using 32b system with so much memory. This will always bump into problems because of the inherent kernel/userspace split. Also I would bet that the problem you are seeing is the lack of lowmem memory which is considered for the dirty writers throttling unless you have vm.highmem_is_dirtyable is set to 1 which is not the case in your setup. -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org