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From: Matthew Garrett <mjg59@srcf.ucam.org>
To: "D. Jansen" <d.g.jansen@googlemail.com>
Cc: Oliver Neukum <oneukum@suse.de>,
	Dave Chinner <david@fromorbit.com>,
	linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
	tytso@mit.edu
Subject: Re: [rfc] Ignore Fsync Calls in Laptop_Mode
Date: Thu, 26 May 2011 20:31:11 +0100	[thread overview]
Message-ID: <20110526193110.GA27504@srcf.ucam.org> (raw)
In-Reply-To: <BANLkTincvGV735PKb60Kg0dLX6a1CZ-iNA@mail.gmail.com>

On Thu, May 26, 2011 at 09:01:49AM +0200, D. Jansen wrote:

> Exactly. 0.5 Watts is a lot of energy on a modern system. And on some
> systems with proper link power management in sata and pcie it will be
> even higher (~1 Watt I think). Think not only of the work that will be
> lost if the system crashes (unlikely), but also of the work that could
> never be done because the battery was gone (a certainty).

I don't think link power management is relevant. The hysteresis there is 
sufficiently low that it's only going to make a difference during the 
point where you're actually throwing data across the link.

-- 
Matthew Garrett | mjg59@srcf.ucam.org

  parent reply	other threads:[~2011-05-26 19:31 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-19 13:34 [rfc] Ignore Fsync Calls in Laptop_Mode Dennis Jansen
2011-05-19 13:43 ` Alan Cox
     [not found]   ` <BANLkTikFRwPY_qOQpPmCmNUJbBUsGcuGUw@mail.gmail.com>
     [not found]     ` <20110519153928.40521b93@lxorguk.ukuu.org.uk>
2011-05-19 15:01       ` D. Jansen
2011-05-19 15:02   ` D. Jansen
2011-05-20 15:34     ` Valdis.Kletnieks
2011-05-20  3:39 ` Dave Chinner
2011-05-20  6:01   ` D. Jansen
2011-05-22  0:48     ` Dave Chinner
2011-05-23  8:12       ` Oliver Neukum
2011-05-23 13:05         ` D. Jansen
2011-05-25  0:00         ` Dave Chinner
2011-05-25  6:50           ` Oliver Neukum
2011-05-26  7:01             ` D. Jansen
2011-05-26 10:49               ` Theodore Tso
     [not found]                 ` <BANLkTimNjt4=9v33Z9Nr12xa6GmyJ-Ue5A@mail.gmail.com>
2011-05-26 13:31                   ` Ted Ts'o
2011-05-26 16:05                     ` D. Jansen
2011-05-26 16:21                       ` Ted Ts'o
2011-05-27  7:12                         ` D. Jansen
2011-05-27 14:17                           ` Theodore Tso
2011-05-27 17:51                             ` david
2011-05-29 10:45                             ` D. Jansen
2011-05-30  1:53                               ` david
2011-05-30  7:13                                 ` Oliver Neukum
2011-05-30 12:55                                   ` Valdis.Kletnieks
2011-05-30 18:03                                     ` david
2011-05-30 13:55                                 ` D. Jansen
2011-05-30 18:02                                   ` david
2011-05-30 18:28                                     ` D. Jansen
2011-05-30 18:43                                       ` Valdis.Kletnieks
2011-05-30 19:54                                         ` D. Jansen
2011-05-30 18:45                                       ` david
2011-05-30 19:49                                         ` D. Jansen
2011-05-30 20:53                                           ` david
2011-05-30 21:24                                             ` D. Jansen
2011-05-30 22:41                                               ` david
2011-05-31  2:03                                               ` Ted Ts'o
2011-05-31  2:26                                                 ` david
2011-05-31 13:47                                                 ` D. Jansen
2011-05-31 18:23                                                   ` david
2011-05-31 18:37                                                     ` D. Jansen
2011-05-31 18:54                                                       ` david
2011-05-31 19:04                                                         ` D. Jansen
2011-06-02  7:42                                                 ` D. Jansen
2011-05-31  8:22                                               ` Valdis.Kletnieks
2011-05-30 22:10                                           ` Jesper Juhl
2011-05-31  6:48                                         ` Oliver Neukum
2011-05-26 19:31               ` Matthew Garrett [this message]
2011-05-27  7:22                 ` D. Jansen
2011-05-20 15:28 ` Valdis.Kletnieks
2011-05-20 16:40   ` D. Jansen
2011-05-20 22:03     ` torbenh
2011-05-21  8:23       ` D. Jansen
2011-05-23  8:22     ` Jesper Juhl

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