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You could try the rt patch
http://www.kernel.org/pub/linux/kernel/projects/rt/ From: MrRealityCheck <> To: Sent: Saturday, November 24, 2012 9:00 PM Subject: [ts-7000] Inconsistent usleep and ITIMER_REAL So, I've been using a 3.0.4 kernel from ynezz/mcrapet tweaked for a 7350 for a while now. I also set the kernel HZ to 1000 so I could get close to millisecond timing. That's been working fine. usleep is pretty consistent. Also, ITIMER_REAL has been pretty consistent. I've used this to check the kernel frequency with some code I found via google. The Hz value hovers around 980 Hz. Plus or minus less than 5%.
Now, I wanted to upgrade the kernel. I started with stock 3.5.7 and attempted to apply the 7350 specific and TS board specific stuff e.g. the SD card drivers. When I build the kernel however, my kernel frequency becomes really unpredictable varying from as little as 450 Hz to as much as 950 Hz. Both usleep and ITIMER_REAL are affected. I can't figure out what I'm doing wrong or if the kernel code itself is to blame. I've tried a 3.6.6 kernel and I've tried ynezz's 3.3.8 kernel as well. It's possible I missed something because the ynezz code doesn't have 7350-specific stuff. Any ideas? I've posted something about this to Linuxquestions but have yet to get a response. __._,_.___
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