Microsecond (or one ms) time resolution on an embedded device (Linux Kernel)

Posted by ChrisDiRulli on Stack Overflow See other posts from Stack Overflow or by ChrisDiRulli
Published on 2010-04-01T23:44:40Z Indexed on 2010/04/01 23:53 UTC
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I have a kernel module I've built that requires at least 1 ms time resolution. I currently use do_gettimeofday() but I'm concerned that this won't work once I move my module to an embedded device. The device has a 180 Mz processor (MIPS) and the default HZ value in the kernel is 100. Thus using jiffies will only give me at best 10 ms resolution. That won't cut it.

What I'd like to know is if do_gettimeofday() is based on the timer interrupt (HZ). Can it be guaranteed to provide at least 1 ms of resolution?

Thanks!

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Developer IT

Microsecond (or one ms) time resolution on an embedded device (Linux Kernel) - Developer IT

Microsecond (or one ms) time resolution on an embedded device (Linux Kernel)

linux-kernel

c

embedded-linux

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