Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

From: Pavel Machek
Date: Mon May 19 2008 - 05:03:30 EST


On Fri 2008-05-16 13:05:45, Andrew Morton wrote:
> On Fri, 16 May 2008 14:02:46 -0500 Eric Sandeen <sandeen@xxxxxxxxxx> wrote:
> > A collection of patches to make ext3 & 4 use barriers by
> > default, and to call blkdev_issue_flush on fsync if they
> > are enabled.
> Last time this came up lots of workloads slowed down by 30% so I
> dropped the patches in horror.
> I just don't think we can quietly go and slow everyone's machines down
> by this much. The overhead of journalling is already pretty horrid.
> If we were seeing a significant number of "hey, my disk got wrecked"
> reports which attributable to this then yes, perhaps we should change
> the default. But I've never seen _any_, although I've seen claims that
> others have seen reports.

Do you remember seeing "my disk was wrecked" for reiserfs?

I believe I got some corruption, but it was

a) long time ago

b) took half a year of hard powerdowns to provoke

c) I did not report it anywhere because ... it just was not

(cesky, pictures)
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