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From: Maxim Patlasov <MPatlasov@parallels.com>
To: karl.kiniger@med.ge.com
Cc: jack@suse.cz, linux-kernel@vger.kernel.org, t.artem@lycos.com,
	mgorman@suse.de, tytso@mit.edu, akpm@linux-foundation.org,
	fengguang.wu@intel.com, torvalds@linux-foundation.org,
	mpatlasov@parallels.com
Subject: Re: Disabling in-memory write cache for x86-64 in Linux II
Date: Fri, 01 Nov 2013 18:25:56 +0400	[thread overview]
Message-ID: <20131101142426.1065.25534.stgit@dhcp-10-30-17-2.sw.ru> (raw)
In-Reply-To: <20131031142612.GA28003@kipc2.localdomain>

On Thu 31-10-13 14:26:12, Karl Kiniger wrote:
> On Tue 131029, Jan Kara wrote:
> > On Fri 25-10-13 11:15:55, Karl Kiniger wrote:
> > > On Fri 131025, Linus Torvalds wrote:
> ....
> > > Is it currently possible to somehow set above values per block device?
> >   Yes, to some extent. You can set /sys/block/<device>/bdi/max_ratio to
> > the maximum proportion the device's dirty data can take from the total
> > amount. The caveat currently is that this setting only takes effect after
> > we have more than (dirty_background_ratio + dirty_ratio)/2 dirty data in
> > total because that is an amount of dirty data when we start to throttle
> > processes. So if the device you'd like to limit is the only one which is
> > currently written to, the limiting doesn't have a big effect.
>
> Thanks for the info - thats was I am looking for.
>
> You are right that the limiting doesn't have a big effect right now:
>
> on my  4x speed  DVD+RW on /dev/sr0, x86_64, 4GB,
> Fedora19:
>
> max_ratio set to 100  - about 500MB buffered, sync time 2:10 min.
> max_ratio set to 1    - about 330MB buffered, sync time 1:23 min.
>
> ... way too much buffering.

"strictlimit" feature must fit your and Artem's needs quite well. The feature
enforces per-BDI dirty limits even if the global dirty limit is not reached
yet. I'll send a patch adding knob to turn it on/off.

Thanks,
Maxim

  reply	other threads:[~2013-11-01 14:26 UTC|newest]

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-25  7:25 Disabling in-memory write cache for x86-64 in Linux II Artem S. Tashkinov
2013-10-25  8:18 ` Linus Torvalds
2013-10-25  8:30   ` Artem S. Tashkinov
2013-10-25  8:43     ` Linus Torvalds
2013-10-25  9:15       ` Karl Kiniger
2013-10-29 20:30         ` Jan Kara
2013-10-29 20:43           ` Andrew Morton
2013-10-29 21:30             ` Jan Kara
2013-10-29 21:36             ` Linus Torvalds
2013-10-31 14:26           ` Karl Kiniger
2013-11-01 14:25             ` Maxim Patlasov [this message]
2013-11-01 14:31             ` [PATCH] mm: add strictlimit knob Maxim Patlasov
2013-11-04 22:01               ` Andrew Morton
2013-11-06 14:30                 ` Maxim Patlasov
2013-11-06 15:05                 ` [PATCH] mm: add strictlimit knob -v2 Maxim Patlasov
2013-11-07 12:26                   ` Henrique de Moraes Holschuh
2013-11-22 23:45                   ` Andrew Morton
2013-10-25 11:28       ` Disabling in-memory write cache for x86-64 in Linux II David Lang
2013-10-25  9:18     ` Theodore Ts'o
2013-10-25  9:29       ` Andrew Morton
2013-10-25  9:32         ` Linus Torvalds
2013-10-26 11:32           ` Pavel Machek
2013-10-26 20:03             ` Linus Torvalds
2013-10-29 20:57           ` Jan Kara
2013-10-29 21:33             ` Linus Torvalds
2013-10-29 22:13               ` Jan Kara
2013-10-29 22:42                 ` Linus Torvalds
2013-11-01 17:22                   ` Fengguang Wu
2013-11-04 12:19                     ` Pavel Machek
2013-11-04 12:26                   ` Pavel Machek
2013-10-30 12:01             ` Mel Gorman
2013-11-19 17:17               ` Rob Landley
2013-11-20 20:52                 ` One Thousand Gnomes
2013-10-25 22:37         ` Fengguang Wu
2013-10-25 23:05       ` Fengguang Wu
2013-10-25 23:37         ` Theodore Ts'o
2013-10-29 20:40           ` Jan Kara
2013-10-30 10:07             ` Artem S. Tashkinov
2013-10-30 15:12               ` Jan Kara
2013-11-05  0:50   ` Andreas Dilger
2013-11-05  4:12     ` Dave Chinner
2013-11-07 13:48       ` Jan Kara
2013-11-11  3:22         ` Dave Chinner
2013-11-11 19:31           ` Jan Kara
2013-10-25 10:49 ` NeilBrown
2013-10-25 11:26   ` David Lang
2013-10-25 18:26     ` Artem S. Tashkinov
2013-10-25 19:40       ` Diego Calleja
2013-10-25 23:32         ` Fengguang Wu
2013-11-15 15:48           ` Diego Calleja
2013-10-25 20:43       ` NeilBrown
2013-10-25 21:03         ` Artem S. Tashkinov
2013-10-25 22:11           ` NeilBrown
     [not found]             ` <CAF7GXvpJVLYDS5NfH-NVuN9bOJjAS5c1MQqSTjoiVBHJt6bWcw@mail.gmail.com>
2013-11-05  1:47               ` David Lang
2013-11-05  2:08               ` NeilBrown
2013-10-29 20:49       ` Jan Kara

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