<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.6000.16674" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>I have been using, for the last weeks joyride-2232
and now I have</FONT></DIV>
<DIV><FONT face=Arial size=2>joyride-2263. On the other XO, I have a much
earlier joyride (1***).</FONT></DIV>
<DIV><FONT face=Arial size=2>Comparing the RT audio performance of the two, I
must say</FONT></DIV>
<DIV><FONT face=Arial size=2>I am disappointed with how worse it has
got.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>One of the things I have been playing with is a
little MIDI file player</FONT></DIV>
<DIV><FONT face=Arial size=2>(one of the test/example activities in
devel.laptop.org/activities/csndsugui),</FONT></DIV>
<DIV><FONT face=Arial size=2>which uses a soundfont synthesis engine. On the
older system, I</FONT></DIV>
<DIV><FONT face=Arial size=2>can play most files with only the occasional
dropout, generally</FONT></DIV>
<DIV><FONT face=Arial size=2>quite solidly. But on the later (2232 and 2263), I
get many more</FONT></DIV>
<DIV><FONT face=Arial size=2>dropouts. Every now and then the OS seems to get a
break and</FONT></DIV>
<DIV><FONT face=Arial size=2>go out for coffee or something and the playback
gets interrupted for</FONT></DIV>
<DIV><FONT face=Arial size=2>a few ms. I wondered about a change in</FONT></DIV>
<DIV><FONT face=Arial size=2>preemption settings in the kernel that comes with
the new OS.</FONT></DIV>
<DIV><FONT face=Arial size=2>For some reason, 2263 seems slightly better
than 2232, but I have</FONT></DIV>
<DIV><FONT face=Arial size=2>to test more (I only updated it this
evening)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I will keep testing, but I expect that this will
also have an impact</FONT></DIV>
<DIV><FONT face=Arial size=2>on TamTam. I wonder if more 'aggressive' RT
preemption patches</FONT></DIV>
<DIV><FONT face=Arial size=2>(Ingo Molnar's ones come to mind) would be
something worth</FONT></DIV>
<DIV><FONT face=Arial size=2>considering. I am not sure whether OLPC would
entertain the idea,</FONT></DIV>
<DIV><FONT face=Arial size=2>but I would very much like to see the RT
performance improved</FONT></DIV>
<DIV><FONT face=Arial size=2>one way or another.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Victor</FONT></DIV></BODY></HTML>