Messages in this thread | | | Date | Tue, 26 Sep 2006 01:21:51 +0200 | From | Pavel Machek <> | Subject | Re: When will the lunacy end? (Was Re: [PATCH] uswsusp: add pmops->{prepare,enter,finish} support (aka "platform mode")) |
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Hi!
On Mon 2006-09-25 16:06:48, Andrew Morton wrote: > On Tue, 26 Sep 2006 00:45:00 +0200 > Pavel Machek <pavel@ucw.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?
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...?
15 seconds spend within drivers is definitely _not_ okay. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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