> Finding a network path efficient relay is very important for reducing > latency in real-time media flows.
Yes, this is very true and interestingly enough seems to have been solved by running auxiliary applications, mostly PING apps to measure the following metrics for neighbors: 1. Latency, 2. Number of IP routing hops, 3. Bandwidth. The DHT also plays a role. See <draft-baset-sipping-p2pcommon-00> The impact of neighbor selection was a big topic in the DHT research community, so I won't flood the list with more references :-) Henry Henry -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dean Willis Sent: Friday, March 14, 2008 11:34 AM To: [EMAIL PROTECTED] Cc: [email protected] Subject: Re: [P2PSIP] separate message for service lookup? On Mar 14, 2008, at 11:28 AM, John Buford wrote: > Regarding Henning's comment that DHT lookup seems sufficient > for handling service lookups, there have been a number of > papers which directly use the DHT for > - serving DNS records > - locating relay peers in an overlay, including discovery > by network position > - location telephony feature serving peers in an overlay > - locating servers for other service discovery mechanisms like SLP > > no modification to the DHT or overlay protocol was needed to > support these cases. as long as you can describe a service > with a key that all participating peers understand, the DHT should > work for service lookup. > > there are some cases where the service-related resource's > availability is dynamic (e.g., relay load for admission control), > which could be part of the advertisement. then there is a > tradeoff between updating the DHT-stored advertisement when > the load changes or leaving it for service invocation time for > the invoking peer to find out. It is, however, more difficult to provide weighting and/or adaptive load balancing to services using a DHT lookup than it might be with other techniques. It is also difficult to rank services on their network-path optimaility unless such a ranking is implicit in the underlying DHT. Finding a network path efficient relay is very important for reducing latency in real-time media flows. -- Dean _______________________________________________ P2PSIP mailing list [email protected] https://www.ietf.org/mailman/listinfo/p2psip _______________________________________________ P2PSIP mailing list [email protected] https://www.ietf.org/mailman/listinfo/p2psip
