linux-ext4 - Re: Enable asynchronous commits by default patch revoked?

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Message-Id: <200908250816.44892.Christian.Fischer@easterngraphics.com>
Date:	Tue, 25 Aug 2009 08:16:44 +0200
From:	Christian Fischer <Christian.Fischer@...terngraphics.com>
To:	Theodore Tso <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Enable asynchronous commits by default patch revoked?

On Monday 24 August 2009, Theodore Tso wrote:
> On Mon, Aug 24, 2009 at 10:33:10AM +0200, Christian Fischer wrote:
> > I try to figure out reasonable mount options for ext4.
> >
> > I've seen a "Enable asynchronous commits by default" patch from Sun, 21
> > Sep 2008.
> >
> > Why is it revoked?
>
> It patch was never merged because the ayschronous commits feature
> disabled all write barriers, so under heavy workloads a power failure
> could cause data loss.
>
> No one has gotten around to looking at this closely; I think adding a
> strategically placed blkdev_issue_flush() will allow us to safely
> enable this feature, but it needs careful study.
>
> Thanks for reminding us about this bit of unfinished business.  I'll
> put it back on our todo list, where it had fallen off.  For now, it's
> not safe to use, which is why it's not enabled by default.
>
>     	    	       	      	       	       - Ted

Hi Ted,

Thanks, good to know that this better isn't to use.

Christian
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