On Tue, 7 Oct 2008 14:34:15 +0100 Pedro Melo <[EMAIL PROTECTED]> wrote:
> Hi, > > On Oct 7, 2008, at 1:00 PM, Pavel Simerda wrote: > > On Mon, 6 Oct 2008 11:53:51 +0100 > > Pedro Melo <[EMAIL PROTECTED]> wrote: > >> On Oct 5, 2008, at 2:07 PM, Pavel Simerda wrote: > >>> Please look into real world, not idealistic. > >>> > >>> Servers have sometimes long timeouts (nobody says they can't), > >>> don't do > >>> any sort of pings (nobody says they must) and many people have > >>> unstable > >>> connections, even on ADSL, but much more on wireless, especially > >>> when moving aroud. > >> > >> IMHO, "pings" are awful. I would much rather have session-reconnect > >> and link-level acks for stanzas. The pair should provide an even > >> more resiliant network than "pings" will ever do. > > > > link-level pings, of course. > > > > This is what you might want to do: > > 1) when you don't get an ack and want to retry last before > > disconnection (maybe not useful at all, not sure) > > This is TCP, one lost ping is enough. That's why I wrote I'm not sure about usefullness. > > > 2) when there are no messages for some time at all (acks are > > correct, but you don't know anyway) > > > > These pings are to be found in xep-198 together with acks, if it > > didn't > > change from last time I saw it. > > They are there. > > > >>> If this is not the case, users become confused and will start to > >>> think Jabber is unreliable. And what more, they will rightly do > >>> so. > >> > >> I agree that reliability is still a problem with the larger XMPP > >> network, specially small servers. > > > > IMO it doesn't depend so much on the scale of the servers. It's > > that... > > The paragraph was meant for S2S connections, sorry, didn't made > myself clear. > > With a small server (small in terms of users) each S2S connection > has light use, so the risk of disconnect for lack of traffic is > higher than on busy servers. > > Hence, on small servers, the first message to a remote domain has a > higher change of failing (the S2S link is not up, and even if the > server buffers the message to send later, he might control the size > of such buffers). > > Best regards, -- Pavel Šimerda Freelancer v oblasti počítačových sítí, komunikace a bezpečnosti Web: http://www.pavlix.net/ Jabber & Mail: pavlix(at)pavlix.net OpenID: pavlix.net
