Messages in this thread | | | Subject | Keystrokes, USB, and Latency | From | Dan Parks <> | Date | 10 Feb 2003 15:05:22 -0500 |
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I have a custom USB driver running in isochronous mode that timestamps itself during it's operation to get statistical information. We have succeeded in minimizing this number to the point that we can run it all day under fairly high load, and it never miss a millisecond (it communicates once a millisecond). However, if the user presses caps lock, num lock, or scroll lock (everything else is ok), it ALWAYS misses 7-8 milliseconds. We are used to stripping down our computers to the bare essential hardware/software, but this just seems bizarre, and after extensive googling, I haven't seen anyone else complain about these keystrokes interfering with gettimeofday() or causing excessive latency. Any information would be appreciated.
Dan
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