linux-kernel - Re: swap file over jffs2 partition

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Date:	Sun, 02 Mar 2008 12:55:09 +0100
From:	Bernd Petrovitsch <bernd@...mix.at>
To:	Dimitrios Apostolou <jimis@....net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: swap file over jffs2 partition

On Fre, 2008-02-29 at 20:13 +0200, Dimitrios Apostolou wrote:
> Bernd Petrovitsch wrote:
> > On Fre, 2008-02-29 at 04:50 +0200, Dimitrios Apostolou wrote:
[....]
> >> swap...). And to avoid wearing out the flash storage too fast, I 'm 
> > 
> > Swapping (and constantly writing logfiles) will wear it out much faster
> > than without. Perhaps not at development time but for sure in the field.
> 
> That's why I want to do it over a wear-levelling layer. Given that the 
> partition is large enough it will hopefully take a while to wear it out.

The wear-levelling only makes all erase blocks/chunks/... wear out at
the same rate (at least more or less). It doesn't avoid or reduce
wearing out, it just distributes it.
Even if you do it: Make sure you have the better flash chips, not the
cheap ones with only 5000 (or so) write cycles. Or even MLCs ....

	Bernd
-- 
Firmix Software GmbH                   http://www.firmix.at/
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          Embedded Linux Development and Services

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