On Wed, 8 Feb 2006, Ricardo A. Reis wrote:
I have a problem with iperf and single udp stream,
[freebsd - RELENG_6] - >>> [ linux-2.6.X]
I in use server mode and no problem occurred, but in client mode this no
complete a udp stream
iperf -c 172.22.1.142 -u -b 100M -t 30
------------------------------------------------------------
Client connecting to 172.22.1.142, UDP port 5001
Sending 1470 byte datagrams
UDP buffer size: 41.1 KByte (default)
------------------------------------------------------------
[ 3] local 172.22.1.166 port 51517 connected with 172.22.1.142 port 5001
write2 failed: No buffer space available
ENOBUFS is the error returned when a process is sending packets faster than
the transmitting interface can actually transmit them. It occurs when the
interface send queue fills, and the packet is dropped. As UDP is a lossy
datagram protocol without flow control, your process doesn't block, but it
does get back an error telling it that the packet could not be transmitted.
I'm not sure how Linux behaves under the same conditions -- it could be there
is silent drop (send returns 0, but the packet is dropped). If the
application has been written without knowing that send() can fail for UDP, it
might not know how to take that into account, and might exit/error out
improperly.
Robert N M Watson
[ 3] 0.0- 0.1 sec 1.45 MBytes 100 Mbits/sec
[ 3] Sent 1037 datagrams
[ 3] Server Report:
# netstat -mb
1/839/840 mbufs in use (current/cache/total)
0/438/438/16832 mbuf clusters in use (current/cache/total/max)
0/4/4464 sfbufs in use (current/peak/max)
0K/1085K/1086K bytes allocated to network (current/cache/total)
0 requests for sfbufs denied
0 requests for sfbufs delayed
0 requests for I/O initiated by sendfile
11 calls to protocol drain routines
Thanks
Ricardo A. Reis
UNIFESP
Unix and Network Admin
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