Re: AW: Re: [PATCH] S4bios for 2.5.52.

[Lyle Seaman <lws-RAHWjsxJnJUdnm+yROfE0A@public.gmane.org>]

> but that sounds like a unpluged block queue which get flushed every 5 seconds (or 30 seconds) by the bdflush daemon. There are two things which counters this, 1st: swsusp works on ide and there aren't such problems since aeons and 2nd Pavel knows that :-)
> Hence, apologies for this hip shot.

I'm not sure I understand what you're saying, Herbert.  

There was something broken in yield() or schedule() back around 2.5.20 - 
2.5.40 that made rw_swap_page_sync EXCRUTIATINGLY slow, but that's been fixed.

Still, writing pages synchronously, one at a time, is going to be slow no 
matter what you do.  *Especially* on slow laptop drives.

What I sent Nigel was a little patch to write them 20 at a time, which reduced 
my suspend times from nearly 60 seconds to something around 2 seconds.  I 
stopped at 20 because going beyond that was chasing diminishing returns and I 
didn't think that chewing up a huge chunk of stack was justified for a 
one-second reduction in suspend times.

I didn't send it on to the rest of the list because I figure Nigel's other 
changes will be coming along as well, and I didn't want to make merging too 
difficult for everyone.






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