after few minutes continue traffic flow rohc uses only CID 0 and all contexts beend used.

[Mohammad Abyan Abdullah]

Hi!!
  After running 30 rtp flow for 10-15 minutes ROHC couldn't allocate more contexts. It always uses CID 0 for new Packet. here is the logs.

[rohc_comp.c:1803 rohc_comp_get_segment2()] no RRU available in given compressor
[rohc_comp.c:5033 rohc_feedback_get()] no feedback is available
[rohc_comp.c:5108 rohc_feedback_get()] add 0 byte(s) of feedback data
[net_pkt.c:75 net_pkt_parse()] outer IP header: 60 bytes
[net_pkt.c:77 net_pkt_parse()] outer IP header: version 4
[net_pkt.c:82 net_pkt_parse()] outer IP header: next header is of type 17
[net_pkt.c:87 net_pkt_parse()] outer IP header: next layer is of type 17
[rohc_comp.c:4608 c_get_profile_from_packet()] try to find the best profile for packet with transport protocol 17
[c_rtp.c:339 c_rtp_check_profile()] RTP packet detected by the RTP callback
[rohc_comp.c:4813 rohc_comp_find_ctxt()] using profile 'IP/UDP/RTP' (0x0001)
[rohc_comp.c:4851 rohc_comp_find_ctxt()] no context was found
[rohc_comp.c:4860 rohc_comp_find_ctxt()] no existing context found for packet, create a new one
[rohc_comp.c:4695 c_create_context()] recycle oldest context (CID = 0)
[c_generic.c:502 c_generic_create()] new generic context required for a new stream
[c_generic.c:528 c_generic_create()] use shift parameter 3 for LSB-encoding of SN
[c_rtp.c:154 c_rtp_create()] initialize context(SN) = hdr(SN) of first packet = 52170
[rohc_comp.c:4767 c_create_context()] context (CID = 0) created (num_used = 451)
[rohc_comp.c:1435 rohc_compress4()] compress the packet #329780
[c_rtp.c:1437 rtp_changed_rtp_dynamic()] find changes in RTP dynamic fields
[c_rtp.c:1453 rtp_changed_rtp_dynamic()] UDP checksum field did not change but changed in the last few packets
[c_rtp.c:1503 rtp_changed_rtp_dynamic()] RTP Padding (P) bit did not change but changed in the last few packets
[c_rtp.c:1529 rtp_changed_rtp_dynamic()] RTP eXtension (X) bit did not change but changed in the last few packets
[c_rtp.c:1554 rtp_changed_rtp_dynamic()] RTP Payload Type (PT) field did not change but changed in the last few packets
[c_rtp.c:1569 rtp_changed_rtp_dynamic()] TS_STRIDE changed now or in the last few packets
[c_rtp.c:1573 rtp_changed_rtp_dynamic()] 4 RTP dynamic fields changed
[c_generic.c:1218 c_generic_detect_changes()] SN = 52170
[c_generic.c:6294 detect_ip_id_behaviour()] no previous IP-ID, consider non-random/static and NBO
[c_generic.c:6358 detect_ip_id_behaviour()] NBO = 1, RND = 0, SID = 0
[c_generic.c:6187 detect_changed_fields()] TTL/HL changed from 0x00 to 0x40
[c_generic.c:6195 detect_changed_fields()] Protocol/NH changed from 0x00 to 0x11
[c_generic.c:5903 changed_static_one_hdr()] protocol_count 3
[c_generic.c:5933 changed_dynamic_both_hdr()] check for changed fields in the outer IP header
[c_generic.c:6011 changed_dynamic_one_hdr()] TTL/HL changed in the current packet
[c_generic.c:6034 changed_dynamic_one_hdr()] DF changed in the current packet
[c_generic.c:6072 changed_dynamic_one_hdr()] NBO changed (0x0 -> 0x1) in the current packet
[c_generic.c:1283 c_generic_detect_changes()] send_static = 1, send_dynamic = 3
[c_rtp.c:1004 rtp_decide_state()] 4 RTP dynamic fields changed, stay in IR state
[c_generic.c:6428 encode_uncomp_fields()] compressor is in state 1
[c_generic.c:6433 encode_uncomp_fields()] new SN = 52170 / 0xcbca
[c_generic.c:6441 encode_uncomp_fields()] IR state: force using 16 bits to encode new SN
[c_generic.c:6456 encode_uncomp_fields()] 16 bits are required to encode new SN
[c_generic.c:6477 encode_uncomp_fields()] new outer IP-ID delta = 0xb7a / 2938 (NBO = 1, RND = 0, SID = 0)
[c_generic.c:6485 encode_uncomp_fields()] IR state: force using 16 bits to encode new outer IP-ID delta
[c_generic.c:6508 encode_uncomp_fields()] 16 bits are required to encode new outer IP-ID delta
[scaled_rtp_ts.c:143 c_add_ts()] Timestamp = 119000
[scaled_rtp_ts.c:160 c_add_ts()] TS_STRIDE cannot be computed, stay in INIT_TS state
[c_rtp.c:1129 rtp_encode_uncomp_fields()] unscaled TS = 119000 on 32 bits
[c_rtp.c:1168 rtp_encode_uncomp_fields()] 32 bits are required to encode new TS
[c_generic.c:1498 decide_packet()] decide packet in IR state
[c_generic.c:1543 decide_packet()] packet 'IR' chosen
[c_generic.c:1720 code_IR_packet()] code IR packet (CID = 0)
[c_generic.c:1739 code_IR_packet()] large CID 0 encoded on 1 byte(s)
[c_generic.c:1751 code_IR_packet()] type of packet + D flag = 0xfd
[c_generic.c:1763 code_IR_packet()] profile ID = 0x01
[c_generic.c:1769 code_IR_packet()] CRC = 0x00 for CRC calculation
[c_generic.c:2090 code_ipv4_static_part()] version = 0x40
[c_generic.c:2095 code_ipv4_static_part()] protocol = 0x11
[c_generic.c:2104 code_ipv4_static_part()] src addr = 0a000201 (10.0.2.1)
[c_generic.c:2111 code_ipv4_static_part()] dst addr = 0a000206 (10.0.2.6)
[c_udp.c:490 udp_code_static_udp_part()] UDP source port = 0x1027
[c_udp.c:495 udp_code_static_udp_part()] UDP dest port = 0x282b
[c_rtp.c:1223 rtp_code_static_rtp_part()] RTP SSRC = 0xa62cee41
[c_generic.c:2340 code_ipv4_dynamic_part()] TOS = 0x00
[c_generic.c:2347 code_ipv4_dynamic_part()] TTL = 0x40
[c_generic.c:2357 code_ipv4_dynamic_part()] IP-ID = 0xd7 0x44
[c_generic.c:2378 code_ipv4_dynamic_part()] (DF = 1, RND = 0, NBO = 1, SID = 0) = 0xa0
[c_generic.c:2390 code_ipv4_dynamic_part()] Generic extension header list = 0x00
[c_rtp.c:1289 rtp_code_dynamic_rtp_part()] UDP checksum = 0x8505
[c_rtp.c:1310 rtp_code_dynamic_rtp_part()] (V = 2, P = 0, RX = 1, CC = 0x0) = 0x90
[c_rtp.c:1320 rtp_code_dynamic_rtp_part()] (M = 0, PT = 0x12) = 0x12
[c_rtp.c:1327 rtp_code_dynamic_rtp_part()] SN = 0xcb 0xca
[c_rtp.c:1335 rtp_code_dynamic_rtp_part()] TS = 0x00 0x01 0xd0 0xd8
[c_rtp.c:1341 rtp_code_dynamic_rtp_part()] Generic CSRC list not supported yet, put a 0x00 byte
[c_rtp.c:1364 rtp_code_dynamic_rtp_part()] (X = 0, Mode = 1, TIS = 0, TSS = 0) = 0x04
[c_generic.c:1809 code_IR_packet()] CRC (header length = 40, crc = 0x17)
[rohc_comp.c:1563 rohc_compress4()] copy full 20-byte payload
[rohc_comp.c:1573 rohc_compress4()] ROHC size = 60 bytes (header = 40, payload = 20), output buffer size = 1350
[rohc_comp.c:4437 __rohc_feedback_remove_locked()] 0 locked feedbacks removed

Regards
Abyan

[Didier Barvaux (didier-barvaux)]

Do you use the IP/ROHC client/server? If yes, what version?

[Mohammad Abyan Abdullah (c-admin-v)]

Hi!!
   yes the version is

IP/ROHC server, version 0.7.1

ROHC Version 1.7.0

Regards
Abyan

[Didier Barvaux (didier-barvaux)]

OK, I see the root of the problem. It is time-related. Let me the day to find the best way to fix it.

[Didier Barvaux (didier-barvaux)]

Please find a patch attached to the bug. It fix the arrival time of packets for the old library API (ie. the one used by IP/ROHC 0.7.x).

Please patch the ROHC library, re-build it, then re-install it. If the IP/ROHC binary was built statically, re-build it then re-install it. Then perform the very same test again. Report me whether it improve the situation or not.

[Mohammad Abyan Abdullah (c-admin-v)]

Hi!!
    I think it solved the problem. I've successfully ran total 600 calls at 32 concurrent rtp stream (using Sipp) without any problem.
And didn't see "no context was found" message anymore. I can see other contexts are using successfully after long period.
And another improvements I noticed is UOR-2-TS packets reduced dramatically.

Thanks for the patch ... :)

Regards
Abyan

[Didier Barvaux (didier-barvaux)]

Thank you for the feedback on the patch. The fix will be part of release 1.7.1