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

Andreas Mohr
2006-03-13T11:13:28Z

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