From 900bfed4718126e6c32244903b6f43e0990d04ad Mon Sep 17 00:00:00 2001 From: Gerrit Renker Date: Sat, 24 Nov 2007 21:58:33 -0200 Subject: [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 Acked-by: Ian McDonald Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- net/dccp/ccids/ccid2.h | 4 ---- 1 file changed, 4 deletions(-) (limited to 'net/dccp/ccids/ccid2.h') diff --git a/net/dccp/ccids/ccid2.h b/net/dccp/ccids/ccid2.h index d9daa534c9be..ed95f8f0cc4a 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; -- cgit v1.2.3