13.2.1 for XO-1 using external SD card slot

[Chris Marshall]

I'll definitely give this a try.  I'm thinking this will be the last
gasp for my family and friend's G1G1 XO-1.  With a more
uptodate linux, more memory and performance (because of
the uncompressed file system), and ability to have swap,
this brings the XO-1 back to usability.

I have been using an SD card install but with the latest
release the support for SD card boot/install was not provided
and I hadn't been able to work through the fixes needed
myself.

--Chris


On Fri, Jun 20, 2014 at 9:49 PM, James Cameron <quozl at laptop.org> wrote:
> On Fri, Jun 20, 2014 at 09:39:32AM +1000, James Cameron wrote:
>> Therefore using an SD card instead of NAND flash should increase I/O
>> performance, decrease processor time, and increase available memory.
>
> I've measured the increase in available memory.
>
> With the laptop freshly booted at the activity view and the journal
> icon coloured, a program is run that consumes memory in order to
> determine how much is available;
>
> - moving the root filesystem from NAND to SDIO is a 7% gain, from 146
>   MB to 156 MB,
>
> - leaving the root filesystem on NAND and adding 64 MB swap on SDIO is
>   a 31% gain, from 146 MB to 191 MB,
>
> - moving the root filesystem from NAND to SDIO and adding 64 MB swap
>   on SDIO is a 41% gain, from 146 MB to 206 MB.
>
> A visualisation of the results:
>
> https://plot.ly/~quozl/7/xo-1-256-mb-usable-memory-1321-nand-vs-sdio-as-root/
>
> The test program:
>
> http://dev.laptop.org/~quozl/z/1WyA0M.txt (oom.c)
>
> Measurement was the anon-rss in the kernel OOM message, e.g.
>
> [  761.307460] Killed process 937 (oom) total-vm:197692kB, anon-rss:183048kB, file-rss:4kB
>
> --
> James Cameron
> http://quozl.linux.org.au/
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