Reason of "dropped due to full socket buffers" UDP

[Artem Naluzhny]

hi

I have 6.1-RELEASE with default sysctl vars. Continuous 'netstat -sp
udp' with 100 ms. interval shows dropped UDP due to full socket
buffers sometimes. The script also monitors 'netstat -anp udp' and
there are no connections with non-zero Recv-Q value by the end of the
interval with drops.

The server is used as SIP server (ser) with RTP proxy (rtpproxy). Avg
pps (Broadcom BCM5721 Gigabit Ethernet, bge): 630 in, 460 out.

Any ideas how to find out a reason? (no kernel changes allowed, the
server is in production)

-- 
tut
DaRK VoIP GuRU