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

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Message-ID: <87iqyc85q7.fsf@basil.nowhere.org>
Date:	Mon, 21 Apr 2008 01:30:08 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Theodore Tso <tytso@....edu>
Cc:	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)

Theodore Tso <tytso@....edu> writes:

> That would be great, although I think the major issue is not
> necessarily the performance problems of using an LVM snapshot on a
> very busy filesystem (althouh I could imagine for some users this
> might be an issue), but rather for filesystem devices that aren't
> using LVM at all.  (I've heard some complaints that LVM imposes a
> performance penalty even if you aren't using a snapshot; has anyone

It always disables barriers if you don't apply a so far unmerged patch
that enables them in some special circumstances (only single
backing device) 

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

-Andi
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