From: Martin Steigerwald <Martin@lichtvoll.de>
To: tuxonice-devel@tuxonice.net
Subject: Re: [TuxOnIce-devel] [linux-pm] [SUSPECTED SPAM] Re: Proposal for a new algorithm for reading & writing a hibernation image.
Date: Mon, 7 Jun 2010 15:07:49 +0200
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Cc: Nigel Cunningham <ncunningham@crca.org.au>,
       "Rafael J. Wysocki" <rjw@sisk.pl>, LKML <linux-kernel@vger.kernel.org>,
       pm list <linux-pm@lists.linux-foundation.org>,
       Maxim Levitsky <maximlevitsky@gmail.com>,
       "TuxOnIce-devel" <tuxonice-devel@tuxonice.net>
References: <9rpccea67yy402c975fqru8r.1275576653521@email.android.com> <201006062104.55869.rjw@sisk.pl> <4C0C843D.6030008@crca.org.au> (sfid-20100607_101218_800330_88257A1C)
In-Reply-To: <4C0C843D.6030008@crca.org.au>
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Am Montag 07 Juni 2010 schrieb Nigel Cunningham:
> Hi.

Hi Nigel and Rafael, hi everyone else involved,

> On 07/06/10 05:04, Rafael J. Wysocki wrote:
> > On Sunday 06 June 2010, Maxim Levitsky wrote:
> >> On Sun, 2010-06-06 at 15:57 +0200, Rafael J. Wysocki wrote:
> >>> On Sunday 06 June 2010, Maxim Levitsky wrote:
> > ...
> >=20
> >>> So how TuxOnIce helps here?
> >>=20
> >> Very simple.
> >>=20
> >> With swsusp, I can save 750MB (memory) + 250 Vram (vram)
> >> With full memory save I can save (1750 MB of memory) + 250 MB of
> >> vram....
> >=20
> > So what about being able to save 1600 MB total instead of the 2 GB
> > (which is what we're talking about in case that's not clear)?  Would
> > it be _that_ _much_ worse?
>=20
> That all depends on what is in the 400MB you discard.
>=20
> The difference is "Just as if you'd never hibernated" vs something
> closer to "Just as if you'd only just started up". We can't make
> categorical statements because it really does depend upon what you
> discard and what you want to do post-resume - that is, how useful the
> memory you discard would have been. That's always going to vary from
> case to case.

Nigel and Rafael, how about just testing it?

Whats needed to have 80% of the memory saved instead of 50%?

I think its important to go the next steps towards a better snapshot in=20
mainline kernel even when you do not agree on the complete end result yet.

What about

=2D Rafael, you review the async write patches of Nigel. If they are good,=
=20
IMHO they should go in as soon as possible.

=2D Nigel and/or Rafael, you look at whats needed to save 80% instead of 50=
%=20
of the memory and develop a patch for it


?

Then this goes into one stable kernel series and be tested in the wild.=20
And if that approach does not suffice to give a similar experience than wit=
h=20
TuxOnIce one could still look further. In that case I ask you Rafael, to=20
at least listen open-mindedly to practical experiences being told and to=20
ideas to improve the situation.

I really want to see this make some progress instead of getting stuck in=20
discussion loops again. No offence meant - you do the all the development=20
work! - but the time spent here IMHO is better spent on reviewing and=20
furtherly refining the existing patches by Nigel and Jiri and developing a=
=20
patchset for the 80% solution which should already help a lot.

Does that incremental approach sound acceptable for the time being?

IMHO *any* step forward helps!

Ciao,
=2D-=20
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de
GPG: 03B0 0D6C 0040 0710 4AFA  B82F 991B EAAC A599 84C7

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