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[Didier Barvaux <question635408@xxxxxxxxxxxxxxxxxxxxx>]

Question #635408 on rohc changed:
https://answers.launchpad.net/rohc/+question/635408

    Status: Open => Needs information

Didier Barvaux requested more information:
Hello,

Here are my first findings with latest ROHC library version.

I made some measurements on structures weights:
       W-LSB size for window width 4 = 88 bytes
       generic_tmp_vars size = 56 bytes
       ip_header_info size = 70304 bytes
       ipv4_header_info size = 96 bytes
       ipv6_header_info size = 70264 bytes
       list_comp size = 70224 bytes
       rohc_list_item size = 2072 bytes -> 16 items = 33152 bytes
       rohc_list size = 144 bytes -> 257 lists = 37008 bytes

       compression context:
              	main    = 160 bytes
              	IP-only = 141080 bytes
              	IP/UDP  = 141100 bytes

So, you're right, the contexts are large. This is the IPv6 part that is
large. Especially the part that handles the list of IPv6 extension
headers. I decreased the number of lists (257 -> 7) and the number of
list items (16 -> 1).

Here are the new results:
       W-LSB size for window width 4 = 88 bytes
       generic_tmp_vars size = 56 bytes
       ip_header_info size = 3224 bytes
       ipv4_header_info size = 96 bytes
       ipv6_header_info size = 3184 bytes
       list_comp size = 3144 bytes
       rohc_list_item size = 2072 bytes -> 1 items = 2072 bytes
       rohc_list size = 144 bytes -> 7 lists = 1008 bytes

       compression context:
              	main    = 160 bytes
              	IP-only = 6920 bytes
              	IP/UDP  = 6940 bytes

Do you need IPv6 support? If yes, do you need support for IPv6 extension
headers?

Regards,
Didier

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