linux-kernel - Re: suspend slow in 2.6.25-rc6 (was Re: Suspend and hibernation patchset against -rc6)

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Date:	Wed, 19 Mar 2008 00:43:43 +0100
From:	Pavel Machek <pavel@....cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	David Brownell <david-b@...bell.net>, Greg KH <greg@...ah.com>,
	Len Brown <lenb@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: suspend slow in 2.6.25-rc6 (was Re: Suspend and hibernation
	patchset against -rc6)

On Tue 2008-03-18 10:31:28, Linus Torvalds wrote:
> 
> 
> On Tue, 18 Mar 2008, Pavel Machek wrote:
> >
> > On Tue 2008-03-18 14:06:42, Pavel Machek wrote:
> > > 
> > > Confirmed, suspend slowness is in 2.6.25-rc6, too. It takes 15 seconds
> > > to suspend/resume, while 2.6.24 takes 9. Thinkpad x60.
> > 
> > IIRC 2.6.25-rc5 was "fast".
> 
> Can you bisect it? There's only 343 commits between -rc5 and -rc6, so it 
> should not take too long to check which commit it is. Even if it should 
> take 9 reboots to bisect it entirely, going just five or six will likely 
> narrow it down sufficiently that we can probably guess fairly well what 
> it's about.

Minimal fix for slowness problem is:

Fix suspend slowness problem, introduced by:

| commit 2c81ce4c9c37b910210f2640c28e98a0c398dc26
| tree e46ccf30836014d115e72791263697585f7943f6
| parent 2f44bbb495dd3e6d0209eff2257438ab9c570e5b
| author Alexey Starikovskiy <astarikovskiy@...e.de> Tue, 11 Mar 2008
| 13:30:00 -0400
| committer Len Brown <len.brown@...el.com> Tue, 11 Mar 2008 13:30:00
| -0400
|
|    ACPI: EC: Handle IRQ storm on Acer laptops

Signed-off-by: Pavel Machek <pavel@...e.cz>

---
commit 2fc3b3069659f4d914cd6863f606c5d01d7d1644
tree 39e9fded0e00ba04947c24073873b5c7ff55af52
parent e094d39e372df9d3e360f2c2672f2860c0995f6a
author Pavel <pavel@....ucw.cz> Wed, 19 Mar 2008 00:43:14 +0100
committer Pavel <pavel@....ucw.cz> Wed, 19 Mar 2008 00:43:14 +0100

 drivers/acpi/ec.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index e7e197e..360adc0 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -230,7 +230,6 @@ static int acpi_ec_wait(struct acpi_ec *
 		while (time_before(jiffies, delay)) {
 			if (acpi_ec_check_status(ec, event))
 				goto end;
-			msleep(5);
 		}
 	}
 	pr_err(PREFIX "acpi_ec_wait timeout,"


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