From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f69.google.com (mail-wm0-f69.google.com [74.125.82.69]) by kanga.kvack.org (Postfix) with ESMTP id 411B66B05D9 for ; Wed, 2 Aug 2017 10:57:17 -0400 (EDT) Received: by mail-wm0-f69.google.com with SMTP id g71so6049747wmg.13 for ; Wed, 02 Aug 2017 07:57:17 -0700 (PDT) Received: from mail.univention.de (mail.univention.de. [82.198.197.8]) by mx.google.com with ESMTPS id o19si5902852wra.335.2017.08.02.07.57.15 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 02 Aug 2017 07:57:15 -0700 (PDT) Subject: Re: [BUG] Slow SATA disk - waiting in balance_dirty_pages() on i686-pae.html References: <2a526c85-0e27-7a5d-f606-66c74499352a@univention.de> <20170802122901.GB2529@dhcp22.suse.cz> From: Philipp Hahn Message-ID: <56b13e56-05c9-da59-d9a5-2a69c19e2cf4@univention.de> Date: Wed, 2 Aug 2017 16:57:13 +0200 MIME-Version: 1.0 In-Reply-To: <20170802122901.GB2529@dhcp22.suse.cz> Content-Type: text/plain; charset=utf-8 Content-Language: en-GB Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: linux-mm@kvack.org, "linux-kernel@vger.kernel.org" Hello, Am 02.08.2017 um 14:29 schrieb Michal Hocko: > On Tue 01-08-17 12:32:40, Philipp Hahn wrote: >> ;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. Thank you for the hint, I will give it a try. Philipp -- 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