This implies that you have ARP_QUEUEING enabled, and MEMP_NUM_ARP_QUEUE is 8.
(These will be specified in your lwipopts.h.)
As described in opt.h, the ARP_QUEUEING option enables a feature where if LWIP
wants to transmit a packet and it doesn't know the MAC address for the
destination IP address (on the local network), it will queue the outgoing
packet temporarily, and issue an ARP request. When the ARP reply arrives, any
packets on the ARP queue for that IP address can be transmitted.
If you disable ARP_QUEUEING, then a missing IP to MAC address mapping will
result in a transmit packet being discarded. The ARP request is issued and the
reply is stored in the ARP cache, but higher level retry mechanisms must be
used to regenerate the lost transmit packet (this is done automatically by TCP,
only resulting in a short delay; UDP would require some form of application
level retries).
"MEM ARP_QUEUE" errors indicate the number of times that LWIP tried to allocate
an entry on the ARP queue when it was already full. In this case your system
tried to send a total of 1193 packets to one or more IP addresses which had
unknown MAC addresses, at one or more points where it already had 8 such
packets queued awaiting the result of an ARP. As a result, those 1193 transmit
packets were discarded.
Not enough information to know whether this all happened in one burst or in
several smaller bursts, or whether the packets were all being sent to the same
or different IP addresses.
Given that this happens after you start up your PC, the likelihood is that your
PC is sending something over the network which triggers a lot of transmission
by LWIP (most likely back to the PC), and for some reason LWIP doesn't have the
PC's MAC address so it needs to use the ARP queue while awaiting the result of
an ARP request.
Wireshark should at least reveal the start of the exchange (but won't show all
the discarded packets, of course.)
----- Original Message -----
From: Marco Jakobs
To: [email protected]
Sent: Thursday, July 08, 2010 4:42 AM
Subject: Re: [lwip-users] Windows 7 Startup crashes LwIP and Free RTOS
Hi,
i have set up the discussed environment and have put it on my main network.
Of course it survived my first restart, but i have taken the IPStats after the
startup of my PC.
The only difference i see after the PC startup is a high number of errors in
the "MEM ARP_QUEUE" ... whatever this means. All the other values seems OK so
far ... i'll post it here.
As soon as i got the crash, the devices should output this on the debug
interface where my notebook is listening for it. In this case, i'll post the
"stats after crash" here. But maybe someone can tell me what the high number of
"MEM ARP_QUEUE" errors means ...
MEM ARP_QUEUE
avail: 8
used: 0
max: 8
err: 1193
-- complete stats--
>ipstats
--- IP stack statistics output ---
LINK
xmit: 4780
recv: 3942
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 0
ETHARP
xmit: 1460
recv: 53
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 3180
IP
xmit: 4764
recv: 3794
fw: 0
drop: 3
chkerr: 0
lenerr: 2
memerr: 0
rterr: 1
proterr: 0
opterr: 0
err: 0
cachehit: 0
ICMP
xmit: 0
recv: 0
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 0
UDP
xmit: 4691
recv: 3153
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 0
rterr: 1
proterr: 0
opterr: 0
err: 0
cachehit: 1
TCP
xmit: 74
recv: 79
fw: 0
drop: 0
chkerr: 0
lenerr: 0
memerr: 4
rterr: 0
proterr: 0
opterr: 0
err: 0
cachehit: 0
MEM HEAP
avail: 8192
used: 188
max: 2460
err: 0
MEM UDP_PCB
avail: 64
used: 3
max: 5
err: 0
MEM TCP_PCB
avail: 32
used: 1
max: 1
err: 0
MEM TCP_PCB_LISTEN
avail: 32
used: 3
max: 3
err: 0
MEM TCP_SEG
avail: 16
used: 1
max: 3
err: 0
MEM NETBUF
avail: 16
used: 0
max: 6
err: 0
MEM NETCONN
avail: 16
used: 7
max: 8
err: 0
MEM TCPIP_MSG_API
avail: 8
used: 0
max: 0
err: 0
MEM TCPIP_MSG_INPKT
avail: 8
used: 0
max: 3
err: 0
MEM ARP_QUEUE
avail: 8
used: 0
max: 8
err: 1193
MEM SYS_TIMEOUT
avail: 6
used: 2
max: 2
err: 0
MEM PBUF_REF/ROM
avail: 16
used: 0
max: 1
err: 0
MEM PBUF_POOL
avail: 64
used: 0
max: 15
err: 0
SYS
sem.used: 0
sem.max: 0
sem.err: 0
mbox.used: 0
mbox.max: 0
mbox.err: 0
OK.
>
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