Gerrit Renker wrote:
I would appreciate some advice and insights regarding the use of
high-resolution timers within a transport protocol, specifically
DCCP with CCID-3 (RFC 5348).
> ...
>
Summing up, I have doubts that basing CCID-3 will bring advantages and
would much rather go the other way and (consistently) use lower resolution.
Thoughts?
I agree. If one way must be chosen, then choose lower resolution timers.
The biggest potential problem with lower-resolution timers is that a sender's
rate might be limited, not by network characteristics, but by timer
resolution. But DCCP allows a fair amount of burstiness already. And there
may be ways to avoid rate limitation in common cases without resorting to
hrtimers. For example, a sending application could use a mixture of
non-blocking system calls, allowing the sending application to "poke" the DCCP
implementation on every scheduling.
At any rate, it seems worth trying.
Eddie
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