[sr-dev] Big TCP message

[Klaus Darilion]

Hi!

-b is the receive buffer of the socket in the OS (for UDP tweaking, I do 
not know if this is relevant for TCP), so not related to this problem as 
this problem happens inside Kamailio.

Actually 15K is rather small, really strange that you get errors. So, I 
did some tests:

1. tcp_rd_buf_size must be increased. The documentation is bad as it 
meantions "TCP datagram" but actually means the maximum size of SIP (or 
HTTP) message that can be received.

2. tcp_rd_buf_size is internally limited to 16MBytes. If you need more, 
you have to change the code in:
tcp_options.c:  { "rd_buf_size", CFG_VAR_INT | CFG_ATOMIC, 512,    
16777216,  0,         0,

3. If you use real large message you may need to increase the private 
memory, and if you forward it with tm module, also the shared memory.

regards
Klaus


Am 02.01.2013 13:59, schrieb Amit Elbaz:
> this still does not solve the problem.
> I've also tried running Kamailio with *-b 32768* option.
>
> here are the logs:
>
> Jan  2 14:54:24 debdev kamailio[2580]: ERROR: <core> [tcp_read.c:344]: 
> ERROR: tcp_read: buffer overrun, dropping
> Jan  2 14:54:24 debdev kamailio[2580]: ERROR: <core> 
> [tcp_read.c:1127]: ERROR: tcp_read_req: error reading
>
> Thanks for your help.
>
> On Wed, Jan 2, 2013 at 1:17 PM, Andrew Pogrebennyk 
> <apogrebennyk at sipwise.com <mailto:apogrebennyk at sipwise.com>> wrote:
>
>     Hi,
>     you may try changing the tcp_rd_buf_size and tcp_conn_wq_max:
>     http://www.kamailio.org/wiki/cookbooks/3.3.x/core#tcp_conn_wq_max
>
>     And since this in development mailing list I'd like to point at what
>     seem an iaccuracy in documentation: several options refer to the core
>     parameter called tcp_write_buf, which isn't described in the cookbook:
>
>     tcp_conn_wq_max
>     Maximum bytes queued for write allowed per connection. Attempting to
>     queue more bytes would result in an error and in the connection being
>     closed (too slow). If *tcp_write_buf* is not enabled, it has no
>     effect.
>
>     I hope Daniel or someone who knows reads this..
>
>     BR,
>     Andrew
>
>     On 01/02/2013 10:38 AM, Amit Elbaz wrote:
>     > Hi,
>     >
>     > While sending a big TCP SIP message (15K+), I get "tcp_read: buffer
>     > overrun, dropping" message.
>     > this happens after a few fragments have been sent, and then i
>     get this
>     > message and the connection resets.
>     > is it possible to set the max-buffer size through configuration?
>     if so,
>     > where?
>     >
>     > Thanks, Amit.
>     >
>     >
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