linux-ext4 - Re: ext4 extent status tree LRU locking

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Message-ID: <51B8B54D.2040200@sr71.net>
Date:	Wed, 12 Jun 2013 10:52:13 -0700
From:	Dave Hansen <dave@...1.net>
To:	Dave Hansen <dave.hansen@...el.com>, linux-ext4@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Theodore Ts'o <tytso@....edu>, Jan kara <jack@...e.cz>,
	gnehzuil.liu@...il.com
Subject: Re: ext4 extent status tree LRU locking

FWIW, I'm also seeing this contention to a much smaller extent on much
more "normal" hardware.  I've got a 6-core (as opposed to 80) desktop
machine where I'm doing the same test on a real disk (instead of a
loopback-mounted ramfs file).

I'm seeing _about_ 10% CPU time being used on just spinning on the same
ext4 LRU lock.
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