linux-kernel - Re: [linux-pm] Swsusp patches applied to suspend-2.6#linux-next

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Date:	Sat, 2 Oct 2010 18:49:46 +0200
From:	Martin Steigerwald <Martin@...htvoll.de>
To:	linux-pm@...ts.linux-foundation.org
Cc:	Nigel Cunningham <nigel@...onice.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	"TuxOnIce-devel" <tuxonice-devel@...onice.net>
Subject: Re: [linux-pm] Swsusp patches applied to suspend-2.6#linux-next

Am Montag 27 September 2010 schrieb Nigel Cunningham:
> Hi again Rafael.

Hi Nigel and Rafael,

> As discussed, here are the patches, modified to apply against your
> current linux-next tree. A new first patch splits compression support
> out into its own file, removing the need to have two versions of the
> load_image and save_image routines, minimising the changes to the
> remainder of the patches and making things cleaner than would
> otherwise be the case.
> 
> On my laptop, single-threaded compression actually slows writing down
> from 175MB/s to around 100-120MB/s (depending on how well the image
> compresses). Reading speed improves from 218MB/s to around 245MB/s. I
> expect that multithreaded writing would bring the writing (and
> reading) speeds back up. It's on my swsusp to do list :)

Testing this now (2.6.36-rc4-tp42-suspend-next-vmembase-0-00253-gab9b069-
dirty).

So far so fast:

shambhala:~> grep Image /var/log/syslog | tail -30
Sep 29 09:11:07 shambhala kernel: PM: Image restored successfully.
Sep 29 09:11:07 shambhala kernel: PM: Image written at 47 MB/s.
Sep 29 09:11:07 shambhala kernel: PM: Image read at 45 MB/s.
Sep 29 20:59:32 shambhala kernel: PM: Image restored successfully.
Sep 29 20:59:32 shambhala kernel: PM: Image written at 42 MB/s.
Sep 29 20:59:32 shambhala kernel: PM: Image read at 43 MB/s.
Sep 30 19:17:57 shambhala kernel: PM: Image restored successfully.
Sep 30 19:17:57 shambhala kernel: PM: Image written at 62 MB/s.
Sep 30 19:17:57 shambhala kernel: PM: Image read at 42 MB/s.
Oct  1 11:26:19 shambhala kernel: PM: Image restored successfully.
Oct  1 11:26:19 shambhala kernel: PM: Image written at 18 MB/s.
Oct  1 11:26:19 shambhala kernel: PM: Image read at 45 MB/s.
Oct  2 10:30:24 shambhala kernel: PM: Image restored successfully.
Oct  2 10:30:24 shambhala kernel: PM: Image written at 65 MB/s.
Oct  2 10:30:24 shambhala kernel: PM: Image read at 42 MB/s.
Oct  2 17:44:33 shambhala kernel: PM: Image restored successfully.
Oct  2 17:44:33 shambhala kernel: PM: Image written at 74 MB/s.
Oct  2 17:44:33 shambhala kernel: PM: Image read at 116 MB/s.
Oct  2 17:56:18 shambhala kernel: PM: Image restored successfully.
Oct  2 17:56:18 shambhala kernel: PM: Image written at 68 MB/s.
Oct  2 17:56:18 shambhala kernel: PM: Image read at 125 MB/s.
Oct  2 17:57:40 shambhala kernel: PM: Image restored successfully.
Oct  2 17:57:40 shambhala kernel: PM: Image written at 67 MB/s.
Oct  2 17:57:40 shambhala kernel: PM: Image read at 121 MB/s.
Oct  2 17:58:47 shambhala kernel: PM: Image restored successfully.
Oct  2 17:58:47 shambhala kernel: PM: Image written at 67 MB/s.
Oct  2 17:58:47 shambhala kernel: PM: Image read at 124 MB/s.
Oct  2 18:43:40 shambhala kernel: PM: Image restored successfully.
Oct  2 18:43:40 shambhala kernel: PM: Image written at 68 MB/s.
Oct  2 18:43:40 shambhala kernel: PM: Image read at 122 MB/s.
shambhala:~>

The read ahead patches bring a pretty nice performance upgrade ;).

I wonder a bit about:

Oct  1 11:26:19 shambhala kernel: PM: Image written at 18 MB/s.

This has been without read ahead patches which shouldn't interfere with 
writing anyway.

Ciao,
-- 
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
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