> Could you run "top" command and print out its information?
> "cat /proc/stat" && "cat /proc/interrupts" information are also
> appreciated.
Sure. Info below.
Before running netcat test:
top - 00:02:37 up 2 min, 1 user, load average: 0.07, 0.07, 0.02
Tasks: 24 total, 1 running, 23 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.7%us, 0.0%sy, 0.0%ni, 98.7%id, 0.0%wa, 0.7%hi, 0.0%si,
0.0%st
Mem: 254912k total, 6680k used, 248232k free, 0k buffers
Swap: 0k total, 0k used, 0k free, 3008k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
359 root 20 0 2856 1160 944 R 1.0 0.5 0:01.49 top
3 root 15 -5 0 0 0 S 0.3 0.0 0:00.11 ksoftirqd/0
1 root 20 0 3280 776 656 S 0.0 0.3 0:01.46 init
2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd
4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
5 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 events/0
6 root 15 -5 0 0 0 S 0.0 0.0 0:00.06 khelper
56 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/0
62 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kseriod
80 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pdflush
81 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pdflush
82 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kswapd0
83 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 aio/0
84 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 nfsiod
215 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 mtdblockd
227 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 hid_compat
230 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 rpciod/0
~ # cat /proc/stat
cpu 209 0 0 16892 0 757 0 0 0
cpu0 209 0 0 16892 0 757 0 0 0
intr 79221 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 61353 0 0 0 0 0 17858 0 0 5 2 0 0 0 2 0 1 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0
ctxt 72511
btime 0
processes 360
procs_running 1
procs_blocked 0
~ #
~ # cat /proc/interrupts
M5445X 90: 62109 UART
M5445X 96: 19793 timer
M5445X 99: 6 timer
M5445X 100: 2 fec(TXF)
M5445X 101: 0 fec(TXB)
M5445X 102: 0 fec(TXFIFO)
M5445X 103: 0 fec(TXCR)
M5445X 104: 2 fec(RXF)
M5445X 105: 0 fec(RXB)
M5445X 106: 1 fec(MII)
M5445X 107: 0 fec(LC)
M5445X 108: 0 fec(HBERR)
M5445X 109: 0 fec(GRA)
M5445X 110: 0 fec(EBERR)
M5445X 111: 0 fec(BABT)
M5445X 112: 0 fec(BABR)
~ #
Run netcat test:
target: nc -l -p 3333 > /dev/null &
host: dd if=/dev/zero | nc <target-ip> 3333
Netcat test activity on ethernet ceases after only a few seconds.
Wireshark concurs.
top - 00:05:04 up 5 min, 1 user, load average: 0.00, 0.04, 0.01
Tasks: 25 total, 1 running, 24 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.7%us, 0.0%sy, 0.0%ni, 98.7%id, 0.0%wa, 0.7%hi, 0.0%si,
0.0%st
Mem: 254912k total, 6904k used, 248008k free, 0k buffers
Swap: 0k total, 0k used, 0k free, 3008k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
363 root 20 0 2856 1160 944 R 1.0 0.5 0:00.27 top
362 root 20 0 3280 688 576 S 0.3 0.3 0:00.05 nc
1 root 20 0 3280 776 656 S 0.0 0.3 0:01.46 init
2 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 15 -5 0 0 0 S 0.0 0.0 0:00.12 ksoftirqd/0
4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
5 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 events/0
6 root 15 -5 0 0 0 S 0.0 0.0 0:00.06 khelper
56 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kblockd/0
62 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kseriod
80 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pdflush
81 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pdflush
82 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 kswapd0
83 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 aio/0
84 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 nfsiod
215 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 mtdblockd
227 root 15 -5 0 0 0 S 0.0 0.0 0:00.00 hid_compat
~ # cat /proc/stat
cpu 228 0 0 31924 0 778 0 0 0
cpu0 228 0 0 31924 0 778 0 0 0
intr 106918 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 73732 0 0 0 0 0 32930 0 0 10 96 0 0 0 149 0 1 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0
ctxt 110292
btime 0
processes 364
procs_running 1
procs_blocked 0
~ #
~ # cat /proc/interrupts
M5445X 90: 74523 UART
M5445X 96: 34522 timer
M5445X 99: 10 timer
M5445X 100: 100 fec(TXF)
M5445X 101: 0 fec(TXB)
M5445X 102: 0 fec(TXFIFO)
M5445X 103: 0 fec(TXCR)
M5445X 104: 155 fec(RXF)
M5445X 105: 0 fec(RXB)
M5445X 106: 1 fec(MII)
M5445X 107: 0 fec(LC)
M5445X 108: 0 fec(HBERR)
M5445X 109: 0 fec(GRA)
M5445X 110: 0 fec(EBERR)
M5445X 111: 0 fec(BABT)
M5445X 112: 0 fec(BABR)
~ #
At this point, my proc entry in the fec driver does not indicate any problem:
~ # cat /proc/driver/fec
total interrupts: 284
last interrupt type: 2 [1=tx, 2=rx, 3=mii]
total tx interrupts: 111
total rx interrupts: 172
total mii interrupts: 1
last interrupt event: 0x2000000
total eberr interrupts: 0
total hberr interrupts: 0
tx loop current count: 0
tx loop last count: 1
rx loop current count: 0
rx loop last count: 1
rx last cbd ctrl/status: 0x800
rx last cbd len: 64
rx last cbd buff addr: 0x40407800
rx last netif_rx status: 0
~ #
When starting the netcat test, activity on the ethernet ceases after only
a few seconds. After stopping the dd/nc on the host, I cannot ping the
host from the target or vice versa and the rs-232 console running on the
target does not respond to every key press (usually every second key
press).
I instrumented some of the raw packet handling in the network stack to
attempt to glean a little more info about ping. Running ping from target
to host shows:
~ # ping 192.168.0.2
PING 192.168.0.2 (192.168.0.2): 56 data bytes
[ 490.489407] ping:367 /mnt/nht/linux-2.6.29/net/core/datagram.c:99
wait_for_packet - interrupted
[ 490.500812] ping:367 /mnt/nht/linux-2.6.29/net/core/datagram.c:110
wait_for_packet - timeo=2147483647, err=-512
[ 490.513637] ping:367 /mnt/nht/linux-2.6.29/net/ipv4/raw.c:668
raw_recvmsg - skb_recv_datagram
[ 490.524790] ping:367 /mnt/nht/linux-2.6.29/net/ipv4/raw.c:701
raw_recvmsg - returning err -512
[ 490.536035] ping:367 /mnt/nht/linux-2.6.29/net/core/sock.c:1869
sock_common_recvmsg - recvmsg returned -512
[ 490.548497] ping:367
/mnt/nht/linux-2.6.29/arch/m68k/coldfire/signal.c:804 ERESTART
Other tests which induce similar problems in the network stack include
using wget to pull a large file onto the target.
I can also force netif_rx() to eventually constantly return 1 (pkt
dropped) by using a flood ping at high frequency (see previous post). This
is a different scenario that netcat/wget but possible related to same
cause.
-- Matt
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