linux-kernel - reiserfs do_journal_end unnecessary hd wake up?

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Message-ID: <1df1788c0809031956r2dad6a58l4be82d370b09f870@mail.gmail.com>
Date:	Wed, 3 Sep 2008 23:56:03 -0300
From:	"Bráulio Barros de Oliveira" <brauliobo@...il.com>
To:	reiserfs-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: reiserfs do_journal_end unnecessary hd wake up?

hello,

this is my very first post here. please correct me if necessary.

i'm pretty paranoic with energy save with my laptop. a good way to
save it, is to enable APM for the HD.
that's where I see maybe reiserfs is doing something wrong. even
killing almost every process and not running X, do_journal_end keeps
appearing on powertop and the hard disk keeps waking up and sleeping,
something you can notice by the noisy clicks.

is this behaviour really right?
is there any way to avoid these wakeup (almost 2watts powersave)?

system: archlinux with kernel 2.6.26.3 and standard reiserfs 3.6 fs.

thankx in advance,
bráulio