linux-kernel - Re: 2.6.35.*: horrible (exponential? >linear) slowdown to unusability (ACPI idle?)

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Message-ID: <87eid3zxd9.fsf@spindle.srvr.nix>
Date:	Wed, 08 Sep 2010 23:25:22 +0100
From:	Nix <nix@...eri.org.uk>
To:	John Drescher <drescherjm@...il.com>
Cc:	Damien Wyart <damien.wyart@...e.fr>, linux-kernel@...r.kernel.org
Subject: Re: 2.6.35.*: horrible (exponential? >linear) slowdown to unusability (ACPI idle?)

On 8 Sep 2010, John Drescher spake thusly:
> I believe I have the same problem reported in your first post. Or at
> least a lot of the symptoms.
>
> http://forums.gentoo.org/viewtopic-t-842775-postdays-0-postorder-asc-start-0.html

Yeah, that looks mostly the same, though when I see it with
CONFIG_NO_HZ, I get an increasing slowdown to unusability, not instant
sloth as you do. (The WD GreenPower thing is a complete red herring, of
course: if that was the cause of the sloth, it would be slow in other
kernels too. I see this both on machines with -- non-buggy --
GreenPowers behind an Areca RAID array, and on machines with totally
different brands of drives. ToI is likewise a complete red herring.)
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