rohc team mailing list archive

["Wong, Tak - 0665 - MITLL" <Tak.Wong@xxxxxxxxxx>]

Didier:

 Here is more info.  I also get a few of these

	rohc_lsb_decode() assert
	cannot use scaled TCP sequence number for a packet with an empty payload.

In this case, the payload_len is 0.  Is this caused by mismatched list options, or something else?
Thanks,

TW

-----Original Message-----
From: Rohc [mailto:rohc-bounces+tak.wong=ll.mit.edu@xxxxxxxxxxxxxxxxxxx] On Behalf Of Wong, Tak - 0665 - MITLL
Sent: Tuesday, April 29, 2014 1:33 PM
To: rohc@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Rohc] ROHC TCP dynamic field changes

Hi Didier:

I implemented the list_trans_nr as you suggested, and it seemed to alleviate the mismatching list_option issue.  However, I am getting other decompression errors relating to CRC check.

You said in a previous email:

>> CRC mismatches might happen in real world because a loss burst. In this case, all following packets might well cause CRC mismatches too until the situation >> becomes fine again.

>> Sending a NACK for every CRC mismatch is not a good thing. It will cause the compressor to lower its compression level much more than required.
>> That's the reason of the rate-limiting algorithm.

I am seeing the following errors during test runs.  Are these the results of loss burst, as you mentioned?  So,  the proper way to handle these is a feedback with a NACK?
Thanks and kind regards,
TW

[ 3859.450291] *** parse packet type 'TCP/rnd_8' (118) [ 3859.450292] *** packet_type = 0x76 [ 3859.450294] header_crc (0x6c) != crc (0x2b) on 8 bytes
[ 3859.450298] rohc_mod(6811):   [ERROR] [/home/vamuser/iphc-kernel/rohc/decomp/rohc_decomp.c:1702 d_decode_header()] failed to decompress packet TCP/rnd_8 (code = -5)
[ 3859.450301] rohc_mod(6811):   [ERROR] [/home/vamuser/iphc-kernel/rohc/decomp/rohc_decomp.c:1726 d_decode_header()] status -5
[ 3859.450490] *** parse packet type 'TCP/rnd_8' (118) [ 3859.450492] *** packet_type = 0x76 [ 3859.450494] header_crc (0x6f) != crc (0x2d) on 8 bytes
[ 3859.450496] rohc_mod(6811):   [ERROR] [/home/vamuser/iphc-kernel/rohc/decomp/rohc_decomp.c:1702 d_decode_header()] failed to decompress packet TCP/rnd_8 (code = -5)
[ 3859.450510] rohc_mod(6811):   [ERROR] [/home/vamuser/iphc-kernel/rohc/decomp/rohc_decomp.c:1726 d_decode_header()] status -5
[ 3859.453036] header_crc (0x44) != crc (0x7b) on 8 bytes
[ 3859.453050] rohc_mod(6811):   [ERROR] [/home/vamuser/iphc-kernel/rohc/decomp/rohc_decomp.c:1702 d_decode_header()] failed to decompress packet TCP/rnd_8 (code = -5)
[ 3859.453054] rohc_mod(6811):   [ERROR] [/home/vamuser/iphc-kernel/rohc/decomp/rohc_decomp.c:1726 d_decode_header()] status -5
[ 3859.453141] header_crc (0x7f) != crc (0xd) on 8 bytes
[ 3859.453144] rohc_mod(6811):   [ERROR] [/home/vamuser/iphc-kernel/rohc/decomp/rohc_decomp.c:1702 d_decode_header()] failed to decompress packet TCP/rnd_8 (code = -5)

_______________________________________________
Mailing list: https://launchpad.net/~rohc
Post to     : rohc@xxxxxxxxxxxxxxxxxxx
Unsubscribe : https://launchpad.net/~rohc
More help   : https://help.launchpad.net/ListHelp