linux-kernel - Re: When will the lunacy end? (Was Re: [PATCH] uswsusp: add pmops->{prepare,enter,finish} support (aka "platform mode"))

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Date:	Mon, 25 Sep 2006 17:22:40 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Pavel Machek <pavel@....cz>
Cc:	Nigel Cunningham <ncunningham@...uxmail.org>,
	Stefan Seyfried <seife@...e.de>, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: When will the lunacy end? (Was Re: [PATCH] uswsusp: add
 pmops->{prepare,enter,finish} support (aka "platform mode"))

On Tue, 26 Sep 2006 01:21:51 +0200
Pavel Machek <pavel@....cz> wrote:

> Hi!
> 
> On Mon 2006-09-25 16:06:48, Andrew Morton wrote:
> > On Tue, 26 Sep 2006 00:45:00 +0200
> > Pavel Machek <pavel@....cz> wrote:
> > 
> > > Anyways this boils down to "find which drivers are delaying suspend
> > > and fix them".
> > 
> > The first step would be "find some way of identifying where all the time is
> > being spent".
> > 
> > Right now, netconsole gets disabled (or makes the machine hang) and most of
> > these machines don't have serial ports and the printk buffer gets lost
> > during resume.
> > 
> > The net result is that the machine takes a long time to suspend and resume,
> > and you don't have a clue *why*.
> > 
> > And this is a significant issue, IMO.  In terms of
> > niceness-of-user-interface, being able to suspend in twelve seconds instead
> > of twenty seven rates fairly highly...
> 
> Your machines spend 15 seconds in drivers? Ouch, I did not realize
> _that_. 
> 
> (My machine suspends in 7 seconds, perhaps 2-3 of that are playing
> with drivers, so I just failed to see where the problem is).
> 
> Are these your big SMP servers? Any SCSI involved?

It's my long-suffering Vaio laptop.

> Rafael has "fakesuspend" patches somewhere, but you can probably just
> swapoff -a, then echo disk > /sys/power/state. If you are lucky, that
> should be slow, too... fortunately you'll have useful dmesg buffer
> when you are done. CONFIG_PRINTK_TIMING or something, and you should
> have enough clues...?

That would help.

> 15 seconds spend within drivers is definitely _not_ okay.

I assumed it was the same for everyone else ;)
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