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Re: Q: JFFS2 RAM requirements (and other questions...)



I actually haven't thought of the license issue :-)

To continue the discussion, though: what would a ballpark figure be? Take
any assumptions you will, if you care to write them down.

Thanks again.

----- Original Message ----- 
From: "Alan Cox" <alan@xxxxxxx.uk>
To: "Nitzan Shaked" <calius@xxxxxxx.il>
Cc: <jffs-dev@xxxxxxx.com>
Sent: Saturday, July 03, 2004 5:30 PM
Subject: Re: Q: JFFS2 RAM requirements (and other questions...)


> On Sad, 2004-07-03 at 14:41, Nitzan Shaked wrote:
> > 1) I have read the PDF and other introductry material, and I understand
that
> > for each file a list of nodes in maintained in RAM. For a 32MB
file-system
> > containing "your average stuff" (MP3, MIDI, JPG, no code) -- what would
you
> > say is the RAM requirement ? Is there a way to bound this number?
>
> It would depend on your implementation. Given you can't use the GPL'd
> linux implementation linked to non-free software I suspect you would
> need to re-implement the JFFS2 design (or license code for it from
> some other implementor).
>
> The ram dependancy is really based around the number of nodes on the
> flash and thus the number of changes in the log. You can trade that
> off against performance since you can always look for stuff through
> the flash instead of in RAM. One thing in your favour is presumably that
> you will always write entire files or large blocks if the device is a
> media player of some form while an OS tends to have files that get
> updated/changed and generate a lot of log entries.
>
>
> Alan
>
>
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