Re: [BUG] Slow SATA disk - waiting in balance_dirty_pages() on i686-pae.html

From	Philipp Hahn <hahn@univention.de>
Newsgroups	linux.kernel
Subject	Re: [BUG] Slow SATA disk - waiting in balance_dirty_pages() on i686-pae.html
Date	2017-08-02 17:00 +0200
Message-ID	<ua3hT-2KU-13@gated-at.bofh.it> (permalink)
References	<u9CUp-2Qq-3@gated-at.bofh.it> <ua0WL-1ph-21@gated-at.bofh.it>
Organization	Univention GmbH

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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

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[BUG] Slow SATA disk - waiting in balance_dirty_pages() on  i686-pae.html Philipp Hahn <hahn@univention.de> - 2017-08-01 12:50 +0200
  Re: [BUG] Slow SATA disk - waiting in balance_dirty_pages() on  i686-pae.html Michal Hocko <mhocko@kernel.org> - 2017-08-02 14:30 +0200
    Re: [BUG] Slow SATA disk - waiting in balance_dirty_pages() on  i686-pae.html Philipp Hahn <hahn@univention.de> - 2017-08-02 17:00 +0200

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