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Re: [lwip-users] out of memory -> some packet transmittion skipped (TCP

From: address@hidden
Subject: Re: [lwip-users] out of memory -> some packet transmittion skipped (TCP Previous segment lost)?
Date: Fri, 18 Dec 2009 16:02:44 +0100
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; de; rv:1.9.1.5) Gecko/20091204 Thunderbird/3.0
If you want someone to actually analyze the wireshark log, you might want to attach a pcap file instead of pasting the text (which is not really readable). 
:-)

Simon


Domen Puncer wrote:

Hello!

I'm using rawapi, NO_SYS, all lwip functions are called from the same
thread.
My setup is: lwip device which is a "telnet server", that's dumping some
data to PC, when connected.
It appears that under memory pressure, some packets get lost (not in a
"tcp_write failed way lost", but "tcp sequences got increased, but
packets were never transmitted"). Unfortunately I can't reliably
reproduce this. Sometimes it happens after only some minutes, other
times everything works fine for hours.

I'd be very glad to receive some hints on this one.

Thank you in advance!


lwip device is the de:af:ba:be:00:01 / 192.168.101.98.

log from it:
09:22:43.682: mem_malloc: could not allocate 728 bytes
09:22:43.706: tcp_enqueue : could not allocate memory for pbuf copy size
656
09:22:43.746: server_send_data, tcp_write failed with -1
09:22:43.774: mem_malloc: could not allocate 728 bytes
09:22:43.798: tcp_enqueue : could not allocate memory for pbuf copy size
656
..and it keeps going on and on.

pcb:
  {local_ip = {addr = 1650829504 /* 192.168.101.98 */}, remote_ip = {addr = 3529877696 /* 
192.168.101.210 */}, so_options = 0, tos = 0 '\000', ttl = 255 '\377', next = 0x0, state = 
ESTABLISHED, prio = 64 '@', callback_arg = 0x4000e324, local_port = 1111, accept = 
0x7164<cb_accept>, remote_port = 47170, flags = 4 '\004', rcv_nxt = 133141362, 
rcv_wnd = 2920, rcv_ann_wnd = 2920, rcv_ann_right_edge = 133144282, tmr = 801, polltmr = 0 
'\000', pollinterval = 0 '\000', rtime = 14, mss = 1460, rttest = 815, rtseq = 4627617, sa 
= 7, sv = 3, rto = 24, nrtx = 3 '\003', lastack = 4627617, dupacks = 3 '\003', cwnd = 1460, 
ssthresh = 2920, snd_nxt = 4634231, snd_wnd = 65535, snd_wl1 = 133141362, snd_wl2 = 
4627617, snd_lbb = 4634231, acked = 0, snd_buf = 686, snd_queuelen = 5, unsent = 
0x40008c24, unacked = 0x40008be4, ooseq = 0x0, refused_data = 0x0, sent = 0, recv = 
0x7348<cb_recv>, connected = 0, poll = 0, errf = 0, keep_idle = 1800000, keep_intvl = 
75000, keep_cnt = 9, persist_cnt = 0, persist_backoff = 0 '\000', keep_cnt_sent = 0 '\000'}


packets captured with wireshark:

No.     Time        Source                Destination           Protocol Info
   61314 0.443454    192.168.101.98        192.168.101.210       TCP      
lmsocialserver>  47170 [PSH, ACK] Seq=4619629 Ack=1 Win=2920 Len=1460

Frame 61314 (1514 bytes on wire, 1514 bytes captured)
     Arrival Time: Dec 18, 2009 09:22:42.992757000
     [Time delta from previous captured frame: 0.219257000 seconds]
     [Time delta from previous displayed frame: 0.219257000 seconds]
     [Time since reference or first frame: 0.443454000 seconds]
     Frame Number: 61314
     Frame Length: 1514 bytes
     Capture Length: 1514 bytes
     [Frame is marked: False]
     [Protocols in frame: eth:ip:tcp:data]
     [Coloring Rule Name: TCP]
     [Coloring Rule String: tcp]
Ethernet II, Src: de:af:ba:be:00:01 (de:af:ba:be:00:01), Dst: G-ProCom_68:92:3a 
(00:0f:fe:68:92:3a)
Internet Protocol, Src: 192.168.101.98 (192.168.101.98), Dst: 192.168.101.210 
(192.168.101.210)
Transmission Control Protocol, Src Port: lmsocialserver (1111), Dst Port: 47170 
(47170), Seq: 4619629, Ack: 1, Len: 1460
     Source port: lmsocialserver (1111)
     Destination port: 47170 (47170)
     Sequence number: 4619629    (relative sequence number)
     [Next sequence number: 4621089    (relative sequence number)]
     Acknowledgement number: 1    (relative ack number)
     Header length: 20 bytes
     Flags: 0x18 (PSH, ACK)
     Window size: 2920
     Checksum: 0xa88e [correct]
     [SEQ/ACK analysis]
Data (1460 bytes)

No.     Time        Source                Destination           Protocol Info
   61315 0.443468    192.168.101.210       192.168.101.98        TCP      
47170>  lmsocialserver [ACK] Seq=1 Ack=4621089 Win=65535 Len=0

Frame 61315 (54 bytes on wire, 54 bytes captured)
     Arrival Time: Dec 18, 2009 09:22:42.992771000
     [Time delta from previous captured frame: 0.000014000 seconds]
     [Time delta from previous displayed frame: 0.000014000 seconds]
     [Time since reference or first frame: 0.443468000 seconds]
     Frame Number: 61315
     Frame Length: 54 bytes
     Capture Length: 54 bytes
     [Frame is marked: False]
     [Protocols in frame: eth:ip:tcp]
     [Coloring Rule Name: TCP]
     [Coloring Rule String: tcp]
Ethernet II, Src: G-ProCom_68:92:3a (00:0f:fe:68:92:3a), Dst: de:af:ba:be:00:01 
(de:af:ba:be:00:01)
Internet Protocol, Src: 192.168.101.210 (192.168.101.210), Dst: 192.168.101.98 
(192.168.101.98)
Transmission Control Protocol, Src Port: 47170 (47170), Dst Port: 
lmsocialserver (1111), Seq: 1, Ack: 4621089, Len: 0
     Source port: 47170 (47170)
     Destination port: lmsocialserver (1111)
     Sequence number: 1    (relative sequence number)
     Acknowledgement number: 4621089    (relative ack number)
     Header length: 20 bytes
     Flags: 0x10 (ACK)
     Window size: 65535
     Checksum: 0x6e6c [correct]
     [SEQ/ACK analysis]

No.     Time        Source                Destination           Protocol Info
   61316 0.893178    192.168.101.98        192.168.101.210       TCP      [TCP 
Previous segment lost] lmsocialserver>  47170 [PSH, ACK] Seq=4623754 Ack=1 
Win=2920 Len=1254

Frame 61316 (1308 bytes on wire, 1308 bytes captured)
     Arrival Time: Dec 18, 2009 09:22:43.442481000
     [Time delta from previous captured frame: 0.449710000 seconds]
     [Time delta from previous displayed frame: 0.449710000 seconds]
     [Time since reference or first frame: 0.893178000 seconds]
     Frame Number: 61316
     Frame Length: 1308 bytes
     Capture Length: 1308 bytes
     [Frame is marked: False]
     [Protocols in frame: eth:ip:tcp:data]
     [Coloring Rule Name: Bad TCP]
     [Coloring Rule String: tcp.analysis.flags]
Ethernet II, Src: de:af:ba:be:00:01 (de:af:ba:be:00:01), Dst: G-ProCom_68:92:3a 
(00:0f:fe:68:92:3a)
Internet Protocol, Src: 192.168.101.98 (192.168.101.98), Dst: 192.168.101.210 
(192.168.101.210)
Transmission Control Protocol, Src Port: lmsocialserver (1111), Dst Port: 47170 
(47170), Seq: 4623754, Ack: 1, Len: 1254
     Source port: lmsocialserver (1111)
     Destination port: 47170 (47170)
     Sequence number: 4623754    (relative sequence number)
     [Next sequence number: 4625008    (relative sequence number)]
     Acknowledgement number: 1    (relative ack number)
     Header length: 20 bytes
     Flags: 0x18 (PSH, ACK)
     Window size: 2920
     Checksum: 0xdc87 [correct]
     [SEQ/ACK analysis]
Data (1254 bytes)

No.     Time        Source                Destination           Protocol Info
   61317 0.893210    192.168.101.210       192.168.101.98        TCP      [TCP Dup 
ACK 61315#1] 47170>  lmsocialserver [ACK] Seq=1 Ack=4621089 Win=65535 Len=0

Frame 61317 (54 bytes on wire, 54 bytes captured)
     Arrival Time: Dec 18, 2009 09:22:43.442513000
     [Time delta from previous captured frame: 0.000032000 seconds]
     [Time delta from previous displayed frame: 0.000032000 seconds]
     [Time since reference or first frame: 0.893210000 seconds]
     Frame Number: 61317
     Frame Length: 54 bytes
     Capture Length: 54 bytes
     [Frame is marked: False]
     [Protocols in frame: eth:ip:tcp]
     [Coloring Rule Name: Bad TCP]
     [Coloring Rule String: tcp.analysis.flags]
Ethernet II, Src: G-ProCom_68:92:3a (00:0f:fe:68:92:3a), Dst: de:af:ba:be:00:01 
(de:af:ba:be:00:01)
Internet Protocol, Src: 192.168.101.210 (192.168.101.210), Dst: 192.168.101.98 
(192.168.101.98)
Transmission Control Protocol, Src Port: 47170 (47170), Dst Port: 
lmsocialserver (1111), Seq: 1, Ack: 4621089, Len: 0
     Source port: 47170 (47170)
     Destination port: lmsocialserver (1111)
     Sequence number: 1    (relative sequence number)
     Acknowledgement number: 4621089    (relative ack number)
     Header length: 20 bytes
     Flags: 0x10 (ACK)
     Window size: 65535
     Checksum: 0x6e6c [correct]
     [SEQ/ACK analysis]

No.     Time        Source                Destination           Protocol Info
   61318 0.898309    192.168.101.98        192.168.101.210       TCP      
lmsocialserver>  47170 [PSH, ACK] Seq=4625008 Ack=1 Win=2920 Len=1432

Frame 61318 (1486 bytes on wire, 1486 bytes captured)
     Arrival Time: Dec 18, 2009 09:22:43.447612000
     [Time delta from previous captured frame: 0.005099000 seconds]
     [Time delta from previous displayed frame: 0.005099000 seconds]
     [Time since reference or first frame: 0.898309000 seconds]
     Frame Number: 61318
     Frame Length: 1486 bytes
     Capture Length: 1486 bytes
     [Frame is marked: False]
     [Protocols in frame: eth:ip:tcp:data]
     [Coloring Rule Name: TCP]
     [Coloring Rule String: tcp]
Ethernet II, Src: de:af:ba:be:00:01 (de:af:ba:be:00:01), Dst: G-ProCom_68:92:3a 
(00:0f:fe:68:92:3a)
Internet Protocol, Src: 192.168.101.98 (192.168.101.98), Dst: 192.168.101.210 
(192.168.101.210)
Transmission Control Protocol, Src Port: lmsocialserver (1111), Dst Port: 47170 
(47170), Seq: 4625008, Ack: 1, Len: 1432
     Source port: lmsocialserver (1111)
     Destination port: 47170 (47170)
     Sequence number: 4625008    (relative sequence number)
     [Next sequence number: 4626440    (relative sequence number)]
     Acknowledgement number: 1    (relative ack number)
     Header length: 20 bytes
     Flags: 0x18 (PSH, ACK)
     Window size: 2920
     Checksum: 0x89c1 [correct]
     [SEQ/ACK analysis]
Data (1432 bytes)

No.     Time        Source                Destination           Protocol Info
   61319 0.898322    192.168.101.210       192.168.101.98        TCP      [TCP Dup 
ACK 61315#2] 47170>  lmsocialserver [ACK] Seq=1 Ack=4621089 Win=65535 Len=0

Frame 61319 (54 bytes on wire, 54 bytes captured)
     Arrival Time: Dec 18, 2009 09:22:43.447625000
     [Time delta from previous captured frame: 0.000013000 seconds]
     [Time delta from previous displayed frame: 0.000013000 seconds]
     [Time since reference or first frame: 0.898322000 seconds]
     Frame Number: 61319
     Frame Length: 54 bytes
     Capture Length: 54 bytes
     [Frame is marked: False]
     [Protocols in frame: eth:ip:tcp]
     [Coloring Rule Name: Bad TCP]
     [Coloring Rule String: tcp.analysis.flags]
Ethernet II, Src: G-ProCom_68:92:3a (00:0f:fe:68:92:3a), Dst: de:af:ba:be:00:01 
(de:af:ba:be:00:01)
Internet Protocol, Src: 192.168.101.210 (192.168.101.210), Dst: 192.168.101.98 
(192.168.101.98)
Transmission Control Protocol, Src Port: 47170 (47170), Dst Port: 
lmsocialserver (1111), Seq: 1, Ack: 4621089, Len: 0
     Source port: 47170 (47170)
     Destination port: lmsocialserver (1111)
     Sequence number: 1    (relative sequence number)
     Acknowledgement number: 4621089    (relative ack number)
     Header length: 20 bytes
     Flags: 0x10 (ACK)
     Window size: 65535
     Checksum: 0x6e6c [correct]
     [SEQ/ACK analysis]

No.     Time        Source                Destination           Protocol Info
   61320 1.116775    192.168.101.98        192.168.101.210       TCP      
lmsocialserver>  47170 [PSH, ACK] Seq=4626440 Ack=1 Win=2920 Len=1263

Frame 61320 (1317 bytes on wire, 1317 bytes captured)
     Arrival Time: Dec 18, 2009 09:22:43.666078000
     [Time delta from previous captured frame: 0.218453000 seconds]
     [Time delta from previous displayed frame: 0.218453000 seconds]
     [Time since reference or first frame: 1.116775000 seconds]
     Frame Number: 61320
     Frame Length: 1317 bytes
     Capture Length: 1317 bytes
     [Frame is marked: False]
     [Protocols in frame: eth:ip:tcp:data]
     [Coloring Rule Name: TCP]
     [Coloring Rule String: tcp]
Ethernet II, Src: de:af:ba:be:00:01 (de:af:ba:be:00:01), Dst: G-ProCom_68:92:3a 
(00:0f:fe:68:92:3a)
Internet Protocol, Src: 192.168.101.98 (192.168.101.98), Dst: 192.168.101.210 
(192.168.101.210)
Transmission Control Protocol, Src Port: lmsocialserver (1111), Dst Port: 47170 
(47170), Seq: 4626440, Ack: 1, Len: 1263
     Source port: lmsocialserver (1111)
     Destination port: 47170 (47170)
     Sequence number: 4626440    (relative sequence number)
     [Next sequence number: 4627703    (relative sequence number)]
     Acknowledgement number: 1    (relative ack number)
     Header length: 20 bytes
     Flags: 0x18 (PSH, ACK)
     Window size: 2920
     Checksum: 0x0d95 [correct]
     [SEQ/ACK analysis]
Data (1263 bytes)

No.     Time        Source                Destination           Protocol Info
   61321 1.116795    192.168.101.210       192.168.101.98        TCP      [TCP Dup 
ACK 61315#3] 47170>  lmsocialserver [ACK] Seq=1 Ack=4621089 Win=65535 Len=0

Frame 61321 (54 bytes on wire, 54 bytes captured)
     Arrival Time: Dec 18, 2009 09:22:43.666098000
     [Time delta from previous captured frame: 0.000020000 seconds]
     [Time delta from previous displayed frame: 0.000020000 seconds]
     [Time since reference or first frame: 1.116795000 seconds]
     Frame Number: 61321
     Frame Length: 54 bytes
     Capture Length: 54 bytes
     [Frame is marked: False]
     [Protocols in frame: eth:ip:tcp]
     [Coloring Rule Name: Bad TCP]
     [Coloring Rule String: tcp.analysis.flags]
Ethernet II, Src: G-ProCom_68:92:3a (00:0f:fe:68:92:3a), Dst: de:af:ba:be:00:01 
(de:af:ba:be:00:01)
Internet Protocol, Src: 192.168.101.210 (192.168.101.210), Dst: 192.168.101.98 
(192.168.101.98)
Transmission Control Protocol, Src Port: 47170 (47170), Dst Port: 
lmsocialserver (1111), Seq: 1, Ack: 4621089, Len: 0
     Source port: 47170 (47170)
     Destination port: lmsocialserver (1111)
     Sequence number: 1    (relative sequence number)
     Acknowledgement number: 4621089    (relative ack number)
     Header length: 20 bytes
     Flags: 0x10 (ACK)
     Window size: 65535
     Checksum: 0x6e6c [correct]
     [SEQ/ACK analysis]


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