OLPC upgrades

[Bobby Powers]

On Tue, Feb 3, 2009 at 7:55 PM,  <david at lang.hm> wrote:
> On Wed, 4 Feb 2009, Martin Langhoff wrote:
>
>> On Wed, Feb 4, 2009 at 1:03 PM,  <david at lang.hm> wrote:
>>> Ok, what tools can I use to satisfy you of this 'opinion' that
>>> applications start faster on either KDE or GNOME than on Sugar on the same
>>> hardware.
>>>
>>> by the way, you are the first person I have heard dispute this.
>>
>> Erik has done a few things lately that made me change perspective.
>> Most comparisons have been made against stuff running off the SD-card,
>> and made our Sugar/Fedora look very slow in comparison. Everyone
>> jumped on Python/Sugar.
>>
>> However, our NAND is *slow*, it busy-waits, JFFS2 is slow, and Linux
>> under a bit of mem pressure (and having no swap) starts discarding
>> pages, assuming that disk reads are reasonably fast and
>> non-cpu-blocking. But reading pages from the NAND turns out to be slow
>> and most importantly it pegs the CPU hard.
>>
>> Get the debxo or the vanilla fedoras running on the NAND. The
>> performance delta is not what we thought it would be.
>
> I know that debxo will install on the NAND. I haven't done so on my
> systems yet as I wanted to leave the NAND intact to test the official
> builds. I'll go ahead and do this on one of my boxes.
>
> most of my testing has been via USB, do you have any idea how it compares
> performance wise to the NAND and SD card?
>
> is there any ability to not use JFFS2 on the NAND?

I believe UBIFS is the up and coming JFFS2 killer:
http://www.linux-mtd.infradead.org/doc/ubifs_whitepaper.pdf
I don't know the status of it tho, I believe there was some testing at
1CC recently with mixed results.

bobby

> David Lang
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