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desync ? what is it ? |
NoBoDx
Grand Admiral
Joined: October 14, 2003
Posts: 784
From: Germany / NRW
|  Posted: 2010-09-27 14:24
desync ? what is it ?
you are out-of-sync (de-sync-ed) when data from the server haven't reached your client, but neither the server, nor the client recognize it.
why is it happening ( or why had it happened before )?
the normal, standard transfer-protocol for data over the internet is TCP
those interested in details, can check the link from wikipedia, but here just the basics:
- two persons (-=A=- and -=B=-) (or computers): -=A=- send the numbers 1 - 5 to -=B=-
-- -=A=- send 1 to -=B=-
-- -=B=- recive 1 (-=A=- dont know, if -=B=- got it, or not)
-- -=B=- send -=A=- a confirmation
-- -=A=- recive the confirmation (and know -=B=- recieved the 1)
-- -=A=- send -=B=- a confirmation (-=B=- knows, that -=A=- recieved the confirmation)
-- -=A=- send 2 to -=B=-
-- -=B=- does not recive 2 (-=A=- dont know, if -=B=- got it, or not)
-- after some time -=A=- decide to resend 2 because it didnt get a confirmation from -=B=-
-- -=B=- recive 2 (-=A=- dont know, if -=B=- got it, or not)
-- -=B=- send -=A=- a confirmation
-- -=A=- recive the confirmation (and know -=B=- recieved the 1)
-- -=A=- send -=B=- a confirmation (-=B=- knows, that -=A=- recieved the confirmation)
this is done for each packet
because of the many packets + 2 confirmations the traffic is quite high, but reliable, because -=A=- keep sending each packets, until it is sure, -=B=- recieved it (confirmations are also resend until -=B=- recieve the confirmation from -=A=-)
the final numbers would be 1-2-3-4-5
for ds:
your client might be frozen but the commands will be resend till both know, they reached their target
the result may be like this:
- you press space, but nothing happens
- after a while your client recieve the confirmation and he continue with the orders sent by the server (e.g. your target flew trough you in the meantime resulting in a very fast ship, running at high-speed through you)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
UDP:
-=A=- send 1 to -=B=-
-=A=- send 2 to -=B=- without waiting for a confirmation from -=B=-
-=A=- send 3 to -=B=- without waiting for a confirmation from -=B=-
-=A=- send 4 to -=B=- without waiting for a confirmation from -=B=-
-=A=- send 5 to -=B=- without waiting for a confirmation from -=B=-
but
-=B=- have a bad internet-connection with high packet-loss, so:
-=B=- recieve 1 from -=A=-
-=B=- recieve 3 from -=A=-
-=B=- recieve 5 from -=A=-
this way, the final numers would be (only) 1-3-5
because -=B=- dont have to confirm every package from -=A=- and -=A=- dont have to confirm every confirm from -=B=- data can be send much faster than with tcp
BUT when the connection have a high package-lost, some (or many...) packaged arent recieved by the other one ( maybe your e-jump-command, or the hit from the QST, or the turn-command in front of a planet...) resulting in a de-synchronisation between the server and the client (and neither one even know it)
*first version... have to check spelling/formating/logical errors 
** im fine with it for now
[ This Message was edited by: NoBoDx on 2010-09-27 14:35 ]
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BackSlash
Marshal
Galactic Navy
Joined: March 23, 2003
Posts: 11183
From: Bristol, England
| Posted: 2010-09-27 14:43
Desync is when your client thinks the enemy is at 50% hull and the server states the enemy is at 100%. The client will not realise this, and won't correct the data. This is desync.
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-Shadowalker-™
Admiral
Galactic Navy
Joined: September 23, 2007
Posts: 709
From: Shadows
| Posted: 2010-09-27 14:49
Quote:
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On 2010-09-27 14:43, BackSlash wrote:
Desync is when your client thinks the enemy is at 50% hull and the server states the enemy is at 100%. The client will not realise this, and won't correct the data. This is desync.
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I dont even respect that as a response... i mean really, thats the best you could come up with....
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Vice Admiral Josh Knight
Vice Admiral
Joined: July 25, 2010
Posts: 56
| Posted: 2010-09-27 19:26
Quote:
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On 2010-09-27 14:49, -Shadowalker-™ wrote:
Quote:
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On 2010-09-27 14:43, BackSlash wrote:
Desync is when your client thinks the enemy is at 50% hull and the server states the enemy is at 100%. The client will not realise this, and won't correct the data. This is desync.
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I dont even respect that as a response... i mean really, thats the best you could come up with....
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Isn't what backslash said EXACTLY what it is? No need to get complicated when his answer is perfectly fine.
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