linux-kernel - Re: [Bug #13306] hibernate slow on _second

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Message-Id: <200906082254.30138.rjw@sisk.pl>
Date:	Mon, 8 Jun 2009 22:54:29 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [Bug #13306] hibernate slow on _second_ run

On Thursday 04 June 2009, Johannes Berg wrote:
> Alright, I have managed to trace this.
> 
> http://johannes.sipsolutions.net/files/hibernate-delay-dmesg.txt
> 
> has the dmesg, you can clearly see the delay:
> [50265.143330] ACPI: Waking up from system sleep state S4
> [50265.679141] HDA Intel 0000:00:08.0: restoring config space at offset 0x1 (was 0xb00006, writing 0xb00002)
> [50265.689525] forcedeth 0000:00:0a.0: restoring config space at offset 0x1 (was 0xb00003, writing 0xb00007)
> [50265.699775] ahci 0000:00:0b.0: restoring config space at offset 0x1 (was 0xb00403, writing 0xb00407)
> [50286.294910] pci 0000:00:03.2: PME# disabled

Quite frankly, it looks like resume_device_irqs() itself causes the delay to happen.

The next step would be to put a couple of printk()s in there and see which part
of it triggers the delay.

Best,
Rafael
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