RTC: max(periodic_freq)>64 for users

[Taylan Akdogan]

Hello,

Don't you think the maximum periodic_freq of RTC for
un-privileged users is too small for today's computers, which is
only 64Hz? Yes, there may be still 386s out somewhere, but just
because of those we shouldn't suffer. And, I don't believe that
there are multiuser 386 systems which are open to a wide public
in where there may be UNKNOWN evil users. After all, it is
possible to determine the maximum allowed frequency by using CPU
frequency. Ex:

  F < 100 MHz        max=64
  F = [100,500] MHz  max=1024
  F > 500 MHz        max=8192

Or, anything like this which makes sense... It may be very useful
for applications which require better time precision then the
fixed 100 Hz ticks.

Best regards,
Taylan

PS: On 533MHz PIII, 8192Hz is nothing, not even noticeable. On, 
1.5GHz P4 the overhead is zero for all practical purposes. I can 
provide quantitative numbers for these, if needed.

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Taylan Akdogan              Massachusetts Institute of Technology
[e-mail]                             Department of Physics
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