OLPC 'upstream'

[David Woodhouse]

On Wed, 2006-02-08 at 15:47 +0000, Andy Green wrote:
> "We plan to use the JFFS2 journalling flash file system on the flash..."
> "At this point, OLPC looks most favorably on the GTK+/Pango/ATK toolkit"
> 
> Sounds good!  Be aware tho that large JFFS2 filesystems are really slow
> to mount. 

Feedback on that now that we have it running and I've optimised JFFS2 a
little bit.... it takes 5.9 seconds to mount the 512MiB flash, of which
about 5 seconds is actually spent reading the flash, rather than in
JFFS2 code. The flash controller on the board is reading the flash at
about one tenth of the speed it should be, so our ideal mount time ought
to be under two seconds.

We're working on improving the raw flash speed, and I'm also going
through the JFFS2 'eraseblock summary' code to halve the amount of data
we have to read from the flash at mount time, so even with the existing
hardware it should go down to 3s or so.

I'd like to get it down to ~1s.

-- 
dwmw2