[OLPC-AU] Csound slow on XO 1.75

[thorin kerr]

I've been having some trouble with Csound on the XO 1.75. A quick benchmark
test suggests performance of Csound on the 1.75 is substantially slower.
Attached are two logs of an identical test conducted on an XO 1.5 and an XO
1.75.

of note,
XO 1.5:
Elapsed time at end of performance: real: 38.003s, CPU: 37.290s

XO 1.75
Elapsed time at end of performance: real: 149.952s, CPU: 141.670s

If I were to speculate, without having looked further, my guess is csound
compilation isn't being optimised for ARM. It's causing realtime
performance problems in jam2jam, but I must admit I don't relish the task
of compiling csound myself.


Thorin
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.laptop.org/pipermail/olpc-au/attachments/20120706/20cb4e2a/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: trapped-xo1.5.log
Type: application/octet-stream
Size: 1667 bytes
Desc: not available
URL: <http://lists.laptop.org/pipermail/olpc-au/attachments/20120706/20cb4e2a/attachment.obj>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: trapped-xo1.75.log
Type: application/octet-stream
Size: 1669 bytes
Desc: not available
URL: <http://lists.laptop.org/pipermail/olpc-au/attachments/20120706/20cb4e2a/attachment-0001.obj>