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