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| author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2007-11-24 21:58:33 -0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-01-28 14:54:55 -0800 |
| commit | 900bfed4718126e6c32244903b6f43e0990d04ad (patch) | |
| tree | d4644ea4770657046d762d9997d7a8e1d794ff94 /net/dccp/ccids/ccid2.h | |
| parent | b00d2bbc45a287c9a72374582ce42205f3412419 (diff) | |
| download | op-kernel-dev-900bfed4718126e6c32244903b6f43e0990d04ad.zip op-kernel-dev-900bfed4718126e6c32244903b6f43e0990d04ad.tar.gz | |
[CCID2]: Disable broken Ack Ratio adaptation algorithm
This comments out a problematic section comprising a half-finished algorithm:
- The variable `ccid2hctx_ackloss' is never initialised to a value different from 0 and
hence in fact is a read-only constant.
- The `arsent' variable counts packets other than Acks (it is incremented for every packet),
and there is no test for Ack Loss.
- The concept of counting Acks as such leads to a complex calculation, and the calculation
at the moment is inconsistent with this concept.
The problem is that the number of Acks - rather than the number of windows - is counted,
which leads to a complex (cubic/quadratic) expression - this is not even implemented.
In its current state, the commented-out algorithm interfers with normal processing by
changing Ack Ratio incorrectly, and at the wrong times.
A new algorithm is necessary, which will not necessarily use the same variables as used by
the unfinished one; hence the old variables have been removed.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/ccids/ccid2.h')
| -rw-r--r-- | net/dccp/ccids/ccid2.h | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h index d9daa53..ed95f8f 100644 --- a/net/dccp/ccids/ccid2.h +++ b/net/dccp/ccids/ccid2.h @@ -44,8 +44,6 @@ struct ccid2_seq { * @ccid2hctx_acks - ACKS recv in AI phase * @ccid2hctx_sent - packets sent in this window * @ccid2hctx_lastrtt -time RTT was last measured - * @ccid2hctx_arsent - packets sent [ack ratio] - * @ccid2hctx_ackloss - ack was lost in this win * @ccid2hctx_rpseq - last consecutive seqno * @ccid2hctx_rpdupack - dupacks since rpseq */ @@ -66,8 +64,6 @@ struct ccid2_hc_tx_sock { int ccid2hctx_sent; unsigned long ccid2hctx_lastrtt; struct timer_list ccid2hctx_rtotimer; - unsigned long ccid2hctx_arsent; - int ccid2hctx_ackloss; u64 ccid2hctx_rpseq; int ccid2hctx_rpdupack; int ccid2hctx_sendwait; |
