On 11/15/06, Gerrit Renker <gerrit@xxxxxxxxxxxxxx> wrote:
While working on the promised EWMA patch for CCID 3 packet sizes, I stumbled over two things
and can make no sense of a bit of CCID 3 Receive code:
1) ccid3_hc_rx_sock maintains a real-timer RTT counter ccid3hcrx_rtt
which is an alias for a TFRC structure defined in <linux/tfrc.h>
2) ccid3_hc_rx_packet_recv (detailed below) updates this, but leaves the variable
`win_count = packet->dccphrx_ccval;' entirely untouched after initialisation
It may be that ... ?
* this is because a real-time counter as opposed to the 4-digit window value
counter affords better reliability (but then win_count should be removed)
* this stems from the original TFRC code and might need update
Well, the ccid3 codebase has a long lineage, came from Lulea, passed
thru Waikato and the thru my linux CodingStyle and use slab caches,
turn parts into a lib, etc, so it may have all sorts of dragons, oops,
bugs lurking, Ian has more knowledge about CCID3 and the original
Waikato codebase, so he may well answer your questions while I try to
get the rest of the patch queue processed :-)
- Arnaldo
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