From: Michal Hocko <mhocko@kernel.org>
To: Philipp Hahn <hahn@univention.de>
Cc: linux-mm@kvack.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [BUG] Slow SATA disk - waiting in balance_dirty_pages() on i686-pae.html
Date: Wed, 2 Aug 2017 14:29:01 +0200 [thread overview]
Message-ID: <20170802122901.GB2529@dhcp22.suse.cz> (raw)
In-Reply-To: <2a526c85-0e27-7a5d-f606-66c74499352a@univention.de>
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
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next prev parent reply other threads:[~2017-08-02 12:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-01 10:32 Philipp Hahn
2017-08-02 12:29 ` Michal Hocko [this message]
2017-08-02 14:57 ` Philipp Hahn
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