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Alexander Motin bc7d18ae72 Refactor TCP ISN increment logic. Instead of firing callout at 100Hz to
keep constant ISN growth rate, do the same directly inside tcp_new_isn(),
taking into account how much time (ticks) passed since the last call.

On my test systems this decreases idle interrupt rate from 140Hz to 70Hz.
2011-05-09 07:37:47 +00:00
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