[Sugar-devel] XO-1 vs Sugar 0.104 performance, and swap to NAND Flash

Gonzalo Odiard godiard at sugarlabs.org
Fri Apr 3 11:03:07 EDT 2015

SHC8420412 = 332S

On Thu, Apr 2, 2015 at 12:54 AM, James Cameron <quozl at laptop.org> wrote:

> With Sugar 0.98 in 13.2.1, the XO-1 was so short of memory that adding
> swap gave an obvious benefit.  Thanks to those who have verified this
> for us.
> With Sugar 0.104 in 13.2.4, things seem much better on the XO-1,
> thanks to all the work done by Sugar Labs developers.  But I'm not
> finished testing [1].
> Meanwhile, there's an opportunity to add swap to jffs2 filesystem.
> The XO-1 NAND Flash is rated for 100,000 writes per cell.  The jffs2
> filesystem we use spreads the writes across all the cells.
> There's a risk that swapping to the NAND Flash will shorten the life
> of an XO-1.  It may become slower at reading and writing journal
> entries.  But they might already be so slow that this isn't a problem
> any more.
> What I need is some data from XO-1 that have been used a lot: how long
> does it take to reflash?  To test, surround a copy-nand command with
> timing markers, like this:
> ok t-sec( copy-nand u:\32014o0.img )t-sec
> The result will be on the line above the ok prompt when it is done,
> e.g. 403S, which is 403 seconds.  Send me the serial number, file
> name, and time in seconds.
> Notes:
> 1.  free memory with no activities running is up around the 40 MB
> mark.  Browse running leaves 16 MB free.  Activity startup time is
> much reduced, and reduced still further when the pulsing icon
> animation is switched from 10 times a second to twice a second.  The
> animation is stealing resources!  On the other hand, the spinning
> cursor during startup or in Browse consumes no significant resources.
> http://dev.laptop.org/~quozl/z/1YdW4T.txt shows the change.
> --
> James Cameron
> http://quozl.linux.org.au/
> _______________________________________________
> Sugar-devel mailing list
> Sugar-devel at lists.sugarlabs.org
> http://lists.sugarlabs.org/listinfo/sugar-devel

Gonzalo Odiard

SugarLabs - Software for children learning
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