linux-ext4 - Re: Ordered data mode vs. writeback mode

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Date:	Tue, 17 Jun 2008 11:42:07 -0700
From:	Mingming <cmm@...ibm.com>
To:	Gary Hawco <ghawco@....net>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: Ordered data mode vs. writeback mode


On Mon, 2008-06-16 at 22:59 +0000, Gary Hawco wrote:
> Noticed that the newest set of patches in ext4-patch-queue has ordered data
> mode as the default mode again. Tune2fs is now able to switch modes again.
> 
> What is the preferred mode for a home desktop system with ext4? Is
> writeback still the fastest, but ordered data has more data integrity?  And
> does delalloc only work when writeback is enabled?

The update patch queue has patch to support delalloc on new ordered
mode. There seems an issue, Aneesh is debugging it now.

>  And does the commit=XX
> seconds still only work with writeback mode, ala ext3, or is it a valid
> option with ordered data mode?
> 
Should work for both mode.


Mingming

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