This is a resubmission to fix a problem with accounting for Ack Vector
length in the MPS.
The present solution did not work well: the MPS did not account for Ack Vectors,
so that applications which relied on the MPS value via getopt were
disadvantaged
by having all their Ack Vectors put onto Syncs -- sorely degrading performance.
Found out by testing with gstreamer DCCP plugin.
Hence the revision of these two patches implements a new strategy -- it now
* subtracts an estimated minimum from the MPS -
currently set to 16 bytes (found via experimentation) and
* schedules a Sync only if the actual length is greater than
this minimum _and_ there is no space left on the skb.
Patch #1: Is the revised version of the account-for-option-sizes-in-MPS patch.
Patch #2: Is the revised "exception handler" for overly large Ack Vectors.
Both patches have been uploaded to the test tree on
git://eden-feed.erg.abnd.ac.uk/dccp_exp [dccp]
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