On 7/27/07, Gerrit Renker <[EMAIL PROTECTED]> wrote: > [CCID3]: Revert use of MSS instead of s > > This updates the CCID3 code with regard to two instances of using `MSS' in > place of `s': > > 1. The RFC3390-based initial rate. Both rfc3448bis as well as the Faster > Restart > draft now consistently use `s' instead of MSS. Swapping MSS for s had > been done > shortly after revision 01 of rfc3448bis, but that change subsequently > disappeared. > > 2. According to section 4.2 of rfc3448bis: "If the sender is ready to send > data when > it does not yet have a round trip sample, the value of X is set to s > bytes per > second, for segment size s [...]" > > Apart from tracking documents, this change makes sense: in particular, it > avoids gross > over-estimation if the packet size `s' is small (imagine a VoIP application > with s=64 > bytes and MSS according to Ethernet jumbo frames). > > Signed-off-by: Gerrit Renker <[EMAIL PROTECTED]>
Hmm, I want to think about this. In particular the reference to VoIP - go look at CCID4 and that's EXACTLY what they do in effect (but standard frames - not jumbo). I'm heading down the patch that we should set 3448bis via a socket option as well as faster restart but maybe that's a question we should ask on the IETF list. It really depends on whether existing TFRC is meant to be phased out and replaced or whether the application can choose - like a lot of TCP enhancements e.g. SACK. I think 3448bis should be the default but whether the only option is another question... Ian -- Web1: http://wand.net.nz/~iam4/ Web2: http://www.jandi.co.nz Blog: http://iansblog.jandi.co.nz - To unsubscribe from this list: send the line "unsubscribe dccp" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
