Re: [ck] Re: Faster resuming of suspend technology.

[Andreas Mohr <andi@rhlx01.fht-esslingen.de>]

Hi,

On Mon, Mar 13, 2006 at 11:43:15AM +0100, Pavel Machek wrote:
> On Po 13-03-06 21:35:59, Con Kolivas wrote:
> > wouldn't be too hard to add a special post_resume_swap_prefetch() which 
> > aggressively prefetches for a while. Excuse my ignorance, though, as I know 
> > little about swsusp. Are there pages still on swap space after a resume 
> > cycle?
> 
> Yes, there are, most of the time. Let me explain:
> 
> swsusp needs half of memory free. So it shrinks caches (by emulating
> memory pressure) so that half of memory if free (and optionaly shrinks
> them some more). Pages are pushed into swap by this process.
> 
> Now, that works perfectly okay for me (with 1.5GB machine). I can
> imagine that on 128MB machine, shrinking caches to 64MB could hurt a
> bit. I guess we'll need to find someone interested with small memory
> machine (if there are no such people, we can happily ignore the issue
> :-).

Why not simply use the mem= boot parameter?
Or is that impossible for some reason in this specific case?

I have a P3/450 256M machine where I could do some tests if really needed.

Andreas Mohr
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