: Use RTT of SYN exchange & Patchv2
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b4 am 200701231540.39765@strip-the-willowVersions newest first
- v1 Latest6 of 7 patches 11 repliesIn review
6 of 7 patches are in this archive. The cover letter announces 7.
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 2/7 | : Wrap computation of RFC3390-initial rate into separate functionnet/ | +18 | 3 replies | |
| 3/7 | : Handle Idle and Application-Limited periodsnet/ | +38 | 1 reply | |
| 4/7 | : Provide function for RTT samplingnet/ net/ | +48 | 3 replies | |
| 5/7 | : Use function for CCID 3 RTT samplingnet/ net/ | +11 | 1 reply | |
| 6/7 | : Sample RTT from SYN exchangeinclude/ net/ net/ | +18 | 2 replies | |
| 7/7 | : Use initial RTT sample from SYN exchangenet/ | +16 | 0 replies |
Reviews trailers per patch
3 of 6 patches have a Reviewed-by or Acked-by.
| Patch | Ian McDonald |
|---|---|
| 2/7 | |
| 3/7 | A-b |
| 4/7 | A-b |
| 5/7 | A-b |
| 6/7 | |
| 7/7 |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes.
Cover letter [PATCH 0/7]: Use RTT of SYN exchange & Patchv2
This is
* one revised re-sent (Patch 1)
* a larger patch split into six (to make review easier), implementing the use of SYN-exchange RTT sample to boost the performance of CCID 3. It is kept generic, so that it could be reused later.
I have compiled on x86, SMP and sparc64 and tested on x86. The performance was pretty good, suddenly in later stages the dccp_probe results were quieter (still oscillating during slow-start).
Patch 1: Is Patchv2 for
http://www.erg.abdn.ac.uk/users/gerrit/dccp/patch-backlog/4e_suseconds_t_64-bit-warning.diff
I have removed the `unsigned' casts. Thanks Ian.
Patch 2: Provides a new function rfc3390_initial_rate() for the initial sending rate.
Patch 3: Idle and application limited periods: this correctly implements [RFC 4342, 5.1] in that
the sending rate shall not be reduced below the rfc3390_initial_rate() in an idle period.
Patch 4: DCCP library function for sampling RTTs from packet exchanges.
RTTs are actually sampled quite often in the DCCP code, and so providing a function for this purpose makes sense (it is applied a patch below).
Patch 5: This applies the new function, dccp_sample_rtt(), to replace existing uses.
Patch 6: Sampling RTT from SYN (initial Request/Response) exchange. This implements the recommendation
in the erratum to RFC 4342 and in draft-ietf-dccp-rfc3448bis. The sampling works by adding a timestamp option to the open()ing Request, and catching timestamp echo option on the matching Response. The result is obtained via dccp_sample_rtt() and stored in dccp_sock() so that CCIDs can use it. No extra field required for this, due to exploiting an existing / unused field of dccp_sock via alias.
Patch 7: Implements the use of SYN-exchange RTT for CCID 3, using the mechanism defined in rfc3448bis.
The lot has been uploaded to http://www.erg.abdn.ac.uk/users/gerrit/dccp/patch-backlog