Re: 2.6.9-rc2-mm3: swsusp horribly slow on AMD64

Rafael J. Wysocki
2004-09-26T10:01:05Z

On Saturday 25 of September 2004 23:33, Stefan Seyfried wrote:
> Rafael J. Wysocki wrote:
> > Pavel,
> >
> > I've just tried to suspend my box and I must admit I've given up after 30
> > minutes (sic!) of waiting when there were only 12% of pages written to
disk.
> > Apparently, swsusp slows down to an unacceptable level after saying "PM:
> > Writing image to disk".
>
> is this reproducible?

Yes, it is. 100% of the time, AFAICT, though I've tried it for only a couple
of times.

> can you get sysrq-t / sysrq-p while it is slow
> writing to disk?

Well, I'll try, but sysrq didn't work for me at all on 2.6.9-rc2-mm1, so I'm
not sure if I really can.

> I have seen this, too but i cannot nail it down to some specific
> pattern, it just "sometimes" is slow. Sysrq-p shows me it's almost
> always in "pccardd" (where it shouldn't be during suspend, iiuc).
> Unfortunately Pavel does not see this so we have to convince him that
> this is really a problem ;-)
> So if you can reproduce this, it would be a step in the right direction.

It seems that I can. ;-)

Could it be possible to printk time along with the percentage info (for
debugging purposes only, of course)?

Greets,
RJW

--
- Would you tell me, please, which way I ought to go from here?
- That depends a good deal on where you want to get to.
-- Lewis Carroll "Alice's Adventures in Wonderland"