From: Philipp Hahn <hahn@univention.de>
To: Michal Hocko <mhocko@kernel.org>
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 16:57:13 +0200 [thread overview]
Message-ID: <56b13e56-05c9-da59-d9a5-2a69c19e2cf4@univention.de> (raw)
In-Reply-To: <20170802122901.GB2529@dhcp22.suse.cz>
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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prev parent reply other threads:[~2017-08-02 14:57 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
2017-08-02 14:57 ` Philipp Hahn [this message]
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