[jdev] Re: Presence packets bottleneck on huge rosters
richard at dobson-i.net
Thu Dec 9 08:44:01 CST 2004
> Bresler, Jonathan wrote:
>> One practical consequence for the XML stream is a separate <presence>
>> Stanza is sent from the server to the client for each contact. I have
>> To check the karma code to see if the client connection's karma is
>> For this traffic. 500 contacts means 500 <presence> stanzas, each one
>> being something like 150 bytes longs (payload, not including Ethernet,
>> TCP and IP headers, call it 200 bytes in round numbers). So we get 5
>> contacts per 1kB on the Wire or 100kB, which is 800kb on the wire.
>> Rather heavy duty. ;( But there
>> Does not appear to be any choice at this time....so dribbling the
>> Data out to the client over some time period appears to be desireable.
> Although 1 stanza is not necessarily 1 ethernet packet, and 800KB is not
> much on a LAN for example.
> Do you have a real-life application in mind where such large rosters would
> be used with frequent enough login/logouts to be an issue?
> Another possibility for addressing this case efficiently is stream
> compression - http://www.jabber.org/jeps/jep-0138.html
Or maybe automatically using JEP-0033 to more efficiently distribute the
presence updates to other servers using the bcc function?
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