Re: HTCP versus ICP

From: Alex Rousskov <>
Date: Wed, 1 Jul 1998 00:05:10 -0600 (MDT)

On Wed, 1 Jul 1998, George Michaelson wrote:

> Can you make a first-order guess at the size of the false-hit levels? small
> is very relative to the eye of the beholder.

NLANR caches showed about 5% false hits for cache digests the last time I
could check. I have no information on false hits for ICP.

Also note that the penalty for a false hit with cache digest is sending an
HTTP request and receiving a 504 reply (presumably using a persistent
connection to the peer). This penalty will not be "large" in most cases. I
bet it would be comparable to a delay introduced by ICP-like protocols.

Received on Tue Jun 30 1998 - 23:06:27 MDT

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