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From: "Theodore Ts'o" <tytso@mit.edu>
To: "Artem S. Tashkinov" <t.artem@lycos.com>
Cc: torvalds@linux-foundation.org, fengguang.wu@intel.com,
	akpm@linux-foundation.org, linux-kernel@vger.kernel.org
Subject: Re: Disabling in-memory write cache for x86-64 in Linux II
Date: Fri, 25 Oct 2013 05:18:42 -0400	[thread overview]
Message-ID: <20131025091842.GA28681@thunk.org> (raw)
In-Reply-To: <1814253454.3449.1382689853825.JavaMail.mail@webmail07>

On Fri, Oct 25, 2013 at 08:30:53AM +0000, Artem S. Tashkinov wrote:
> My feeling is that vm.dirty_ratio/vm.dirty_background_ratio should _not_ be
> percentage based, 'cause for PCs/servers with a lot of memory (say 64GB or
> more) this value becomes unrealistic (13GB) and I've already had some
> unpleasant effects due to it.

What I think would make sense is to dynamically measure the speed of
writeback, so that we can set these limits as a function of the device
speed.  It's already the case that the writeback limits don't make
sense on a slow USB 2.0 storage stick; I suspect that for really huge
RAID arrays or very fast flash devices, it doesn't make much sense
either.

The problem is that if you have a system that has *both* a USB stick
_and_ a fast flash/RAID storage array both needing writeback, this
doesn't work well --- but what we have right now doesn't work all that
well anyway.

						- Ted

  parent reply	other threads:[~2013-10-25  9:18 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
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 [this message]
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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