[Standards] s2s and gracelessly broken streams
m at tthias.eu
Mon Apr 2 17:42:17 CDT 2007
Tony Finch schrieb:
>> I think this is best answered in the form of a question: How well do you
>> think SMTP would scale if it held open connections for every domain that
>> is in your address book?
> At my site our central email relays (used by about 30,000 people)
> connected to 5,500 different IP addresses in the last day, so it's
> less of a problem than you might expect.
Your mailserver connected to the servers you exchanged messages with,
not with all the servers of your users in your address book.
But no matter how many s2s connections we have, we must use the
resources we have even on a server as economical as possible. That we
currently have a less economical protocol in terms of needed open
connections on the c2s side is no reason to make s2s less economical.
Due to my experience servers that went down is only the cause for a very
small fraction of wrong presences. Our main problem still seems to be,
that even the user's server has a wrong impression of this user's
presence (i.e. servers that do not detect that a user is not online
anymore). We now have XEP-0199 that allows a server to probe if a client
is still online. We should first see how much the problem of stale
presences is improved if servers XEP-0199-pinging idle clients get more
widely deployed, before we start tweaking less important factors.
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