From: Eddie Kohler <kohler@cs.ucla.edu>
To: dccp@vger.kernel.org
Subject: Re: RTT measurement, CCID3 implementability
Date: Tue, 17 Apr 2007 13:42:04 +0000 [thread overview]
Message-ID: <4624CEAC.2080700@cs.ucla.edu> (raw)
In-Reply-To: <46229A62.9010805@cs.ucla.edu>
Gerrit Renker wrote:
> | - The DCCP specification does not require RTT measurements on every packet
> | exchange.
> |
> | - It should be possible to use coarse grained timestamps (even jiffies) for
> | most packets, with finer grained timestamps used on occasion, to improve the
> | current estimate; for example, getting the time of day once per RTT.
> This is not easily possible without at the same time revising the spec. If you e.g.
> allow jiffie-based round-trip times, then you will need to set the minimum RTT value
> to 1 jiffie, since otherwise divide-by-zero will be likely.
Can you point to where in the specification it requires fine grained
timestamps on all packets?
Eddie
prev parent reply other threads:[~2007-04-17 13:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-15 21:34 RTT measurement, CCID3 implementability Eddie Kohler
2007-04-17 11:07 ` Gerrit Renker
2007-04-17 13:42 ` Eddie Kohler [this message]
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