udp packets dropping

[Arie Kachler]

Hello,

I have a DNS server with a lot of traffic. After just a couple of 
minutes of resetting the netstat -s counters, I get the following output:

         130670 datagrams received
         0 with incomplete header
         0 with bad data length field
         1 with bad checksum
         30 with no checksum
         0 dropped due to no socket
         12 broadcast/multicast datagrams dropped due to no socket
         4226 dropped due to full socket buffers
         0 not for hashed pcb
         126431 delivered
         136753 datagrams output

As time goes by, the "dropped due to full socket buffers" number goes up.

I have increased the sysctl variable net.inet.udp.recvspace to 100000, 
up from about 40000. This did not make any difference, the number goes 
up with time.

The server is running FreeBSD 4.6 RELEASE with Bind 9.2.2.

I went through the newsgroups and did not find any solutions to this 
problem.

Any help will be greatly appreciated.

Arie Kachler
SysAdmin/Telcom.Net