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

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Message-ID: <alpine.LFD.1.00.0803181736340.3020@woody.linux-foundation.org>
Date:	Tue, 18 Mar 2008 17:40:38 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Pavel Machek <pavel@...e.cz>
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, 18 Mar 2008, Pavel Machek wrote:
> 
> It will take a while. My .git directory is 7G, and I'd like to do a
> backup before playing with git.

Ouch, what have you done? It should be about 200MB, not 7GB.

> git gc does not exist here, so I guess I need to update git, too :-(.

Well, even with old git you can just do 

	git repack -a -d

and in your case you'll probably have to leave it running overnight, 
because it's going to take hours since you've clearly not ever repacked it 
before and as a result it's going to do lots and lots of IO (all that 7GB 
and then read much of it twice).

But yeah, upgrading git first is probably a good idea regardless.

> commit 7c0ea45be4f114d85ee35caeead8e1660699c46f
> 
>     ACPI: Ignore _BQC object when registering backlight device
> 
> when did this go in? Pretty recently, right?

Yes:

	[torvalds@...dy linux]$ git describe 7c0ea45be4f114d85ee35caeead8e1660699c46f
	v2.6.25-rc5-89-g7c0ea45

so it happened after -rc5.

> And that means that ACPI backlight driver is now used on machines where 
> it was not used before...?

Somebody more into ACPI needs to judge how likely this is to be an issue..

		Linus
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