linux-ext4 - Re: Mentor for a GSoC application wanted (Online ext2/3 filesystem checker)

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Message-ID: <20080420234241.GB23292@shareable.org>
Date:	Mon, 21 Apr 2008 00:42:42 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Theodore Tso <tytso@....edu>, Eric Sandeen <sandeen@...hat.com>,
	Alexey Zaytsev <alexey.zaytsev@...il.com>,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Rik van Riel <riel@...riel.com>
Subject: Re: Mentor for a GSoC application wanted (Online ext2/3 filesystem checker)

Andi Kleen wrote:
> [LVM] always disables barriers if you don't apply a so far unmerged
> patch that enables them in some special circumstances (only single
> backing device)

(I continue to be surprised at the un-safety of Linux fsync)

> Not having barriers sometimes makes your workloads faster (and less
> safe) and in other cases slower.

I'm curious, how does it make them slower?  Merely not issuing barrier
calls seems like it will always be the same speed or faster.

Thanks,
-- Jamie
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