[ejabberd] Client socket blocked when sending large stanza

Vincent BARAT vincent.barat at ubikod.com
Sun Feb 8 23:16:47 MSK 2009

We have modified the default c2s_shaper from 1KB/S to 4KB/s, and the stanza limit sis still 64KB (which is actually much more than the size of the avatar).

Anyway, I have tried to increase the standza limit to 128KB, but the behavior is the same.

Do you have a more precise recommandation about modifying the default configuration ?

Mickael Remond a écrit :
> Hello,
> Your traffic shapers are not correctly configured for your need.
> You have to change the default setting.
> Vincent BARAT wrote:
>> Hello,
>> We face a big issue here at Ubikod. It happens randomly (but often)
>> that sending a big stanza (an avatar or VCard image in our case) seems
>> to block the client's output socket (as if the server had stopped
>> reading on it).
>> The client is not disconnected, is blocked on a native write call on
>> the socket, and the server never respond, nor close the connection
>> (our client is still considered as connected).  It happens esspecially
>> when there is several XMPP requests pending.
>> Is there any known issue or fix that could be related to this ?
>> Is there a way to add some traces in ejabberd that could help in
>> finding the solution ?
>> Thank for your help.
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