From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Christoph Hellwig <hch@infradead.org>
Cc: Adam Nielsen <a.nielsen@shikadi.net>,
Christoph Hellwig <hch@infradead.org>,
LKML Mailinglist <linux-kernel@vger.kernel.org>
Subject: Re: XFS internal error xfs_da_do_buf(1) at line 2015 of file fs/xfs/xfs_da_btree.c
Date: Sun, 4 Jan 2009 11:44:25 +0000 [thread overview]
Message-ID: <20090104114425.241f6630@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <20090104092349.GA26194@infradead.org>
> On Debian based systems you can add -W0 to /etc/default/hdparm and
> it gets executed before the root filesystem is remounted read-write,
> I'm not sure how other distributions handle it.
Generally they avoid setting -W0 because it ruins performance and can be
very bad for disk lifetime. The barriers code is there for a reason.
Of course certain distributions default to using LVM for all their file
systems which is completely and mindbogglingly bogus. That both messes up
barriers in some cases and takes a good 10-20% off performance when I've
benched it.
LVM is cool - if you need it, most people don't.
Alan
next prev parent reply other threads:[~2009-01-04 11:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-04 1:16 Adam Nielsen
2009-01-04 7:46 ` Christoph Hellwig
2009-01-04 9:03 ` Adam Nielsen
2009-01-04 9:23 ` Christoph Hellwig
2009-01-04 11:44 ` Alan Cox [this message]
2009-01-04 15:34 ` Christoph Hellwig
2009-01-04 15:50 ` Andi Kleen
2009-01-05 5:12 ` markus reichelt
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