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Rockbox mail archiveSubject: 3.10: Performance regression3.10: Performance regression
From: Thomas Jarosch <tomj_at_simonv.com>
Date: Wed, 30 Nov 2011 13:35:37 +0100 Hi, I just noticed a performance regression with rockbox 3.10 compared to rockbox 3.9 on the Nokia N900. CPU usage increased by 15 to 20 percent when playing back a mp3 file. To verify it I downgraded to 3.9, watched the "top" output and upgraded to 3.10 again, always playing back the same mp3 file. Audio playback on maemo 5 is handled by gstreamer / pulseaudio. I can see an even increase in CPU usage both on the running rockbox binary and the pulseaudio daemon. Vague guess: The PCM buffer is passed in smaller chunks to the OS in 3.10 and therefore causing more handling overhead. The "buffering thread" values in the debug menu look similar to me: 3.9: pcm: x/529200, alloc/real: 7170476 3.10: pcm: x/524288, alloc/real: 5180960 Other ideas what might be wrong? We should try to figure out if it also affects real hardware targets or just maemo / other RaaA targets. Cheers, Thomas Received on 2011-11-30 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |