I have been using, for the last weeks joyride-2232 and now I have joyride-2263. On the other XO, I have a much earlier joyride (1***). Comparing the RT audio performance of the two, I must say I am disappointed with how worse it has got.
One of the things I have been playing with is a little MIDI file player (one of the test/example activities in devel.laptop.org/activities/csndsugui), which uses a soundfont synthesis engine. On the older system, I can play most files with only the occasional dropout, generally quite solidly. But on the later (2232 and 2263), I get many more dropouts. Every now and then the OS seems to get a break and go out for coffee or something and the playback gets interrupted for a few ms. I wondered about a change in preemption settings in the kernel that comes with the new OS. For some reason, 2263 seems slightly better than 2232, but I have to test more (I only updated it this evening) I will keep testing, but I expect that this will also have an impact on TamTam. I wonder if more 'aggressive' RT preemption patches (Ingo Molnar's ones come to mind) would be something worth considering. I am not sure whether OLPC would entertain the idea, but I would very much like to see the RT performance improved one way or another. Regards Victor
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