cpu-speed limitations

Andy Green andy at openmoko.com
Mon Aug 4 22:58:48 CEST 2008

Hash: SHA1

Somebody in the thread at some point said:
| Hi all,
| I've noticed that the speed/usability of a lot of apps deteriorates
| when under heavy load: numptyphisics with a lot of objects on stage,
| epiano whith fast successive hits, playing an mp3 with mplayer and
| scrolling in the applications/PIM Suite/Games list.....
| But when you check the cpu-usage of these programs you get percentages
| ranging from 10 to 30 %, with total cpu usage max 50%. Can anyone
| explain this to me?
| To monitor cpu usage I use ps -eo pcpu,pid,user,args
| I'm running a 2007.2 image with an up-to-date kernel on a GTA02v5.
| If you need extra info I will gladly provide it.

This is probably the negative effect of Glamo bandwidth constraints.
All of your examples have some kind of heavy graphical action.  If SD
Card is being accessed at the same time it'll also make it sluggish.

Glamo has the undeserved unique ability to force the CPU to wait for it,
and it isn't shy about using it.  I have some patches pending that
should improve this a bit but how much I dunno.

- -Andy
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