On 24 Jan 2009, at 12:54, Yony Yossef wrote:
Hi All,
I'm facing a temporary network hang on my interfaces following a flood
ping/stress udp test.
I'm running a netperf UDP test which is giving results but does not
return
to the shell.
client output:
UDP UNIDIRECTIONAL SEND TEST from fe80::202:c9ff:fe02:e1fe%mtnic0
(fe80::202:c9ff:fe02:e1fe) port 0 AF_INET6 to
fe80::202:c9ff:fe02:e1f4%mt
nic0 (fe80::202:c9ff:fe02:e1f4) port 0 AF_INET6
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec
32768 1472 10.02 547428 1694280 643.60
32768 10.02 25089 29.50
(HANG)
After a minute or two it returns to the shell with the following
message:
shutdown_control: no response received errno 55
20 minutes later (!!) the interface is working again.
netstat -m and vmstat -z outputs during the hang time:
# netstat -m
25687/6578/32265 mbufs in use (current/cache/total)
17404/2438/19842/65536 mbuf clusters in use (current/cache/total/max)
0/1024 mbuf+clusters out of packet secondary zone in use (current/
cache)
2071/1369/3440/65536 4k (page size) jumbo clusters in use
(current/cache/total/max)
0/0/0/65536 9k jumbo clusters in use (current/cache/total/max)
0/0/0/3200 16k jumbo clusters in use (current/cache/total/max)
49513K/11996K/61510K bytes allocated to network (current/cache/total)
0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters)
0/0/0 requests for jumbo clusters denied (4k/9k/16k)
0/0/0 sfbufs in use (current/peak/max)
0 requests for sfbufs denied
0 requests for sfbufs delayed
0 requests for I/O initiated by sendfile
0 calls to protocol drain routines
I think there are too many mbufs in use. You're probably facing an
mbuf leakage and that causes an interface hang.
--
Rui Paulo
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