From eb279b79c46be767ecffadaa8ed6be3e3555e93d Mon Sep 17 00:00:00 2001 From: Gerrit Renker Date: Tue, 20 Nov 2007 18:00:39 -0200 Subject: [CCID3]: Ignore trivial amounts of elapsed time This patch fixes a previously undiscovered bug; the problem is in computing the elapsed time as the time between `receiving' the packet (i.e. skb enters CCID module) and sending feedback: - there is no layer-processing, queueing, or delay involved, - hence the elapsed time is in the order of 1 function call - this is in the dimension of maximally 50..100usec - which renders the use of elapsed time almost entirely useless. The fix is simply to ignore such trivial amounts of elapsed time. As a further advantage, the now useless elapsed_time field can be removed from the socket, which reduces the socket structure by another four bytes. Signed-off-by: Gerrit Renker Signed-off-by: Ian McDonald Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: David S. Miller --- net/dccp/ccids/ccid3.h | 2 -- 1 file changed, 2 deletions(-) (limited to 'net/dccp/ccids/ccid3.h') diff --git a/net/dccp/ccids/ccid3.h b/net/dccp/ccids/ccid3.h index 0cdc982cfe47..83467c34ed2b 100644 --- a/net/dccp/ccids/ccid3.h +++ b/net/dccp/ccids/ccid3.h @@ -147,7 +147,6 @@ enum ccid3_hc_rx_states { * @ccid3hcrx_li_hist - Loss Interval History * @ccid3hcrx_s - Received packet size in bytes * @ccid3hcrx_pinv - Inverse of Loss Event Rate (RFC 4342, sec. 8.5) - * @ccid3hcrx_elapsed_time - Time since packet reception */ struct ccid3_hc_rx_sock { struct tfrc_rx_info ccid3hcrx_tfrc; @@ -165,7 +164,6 @@ struct ccid3_hc_rx_sock { struct list_head ccid3hcrx_li_hist; u16 ccid3hcrx_s; u32 ccid3hcrx_pinv; - u32 ccid3hcrx_elapsed_time; }; static inline struct ccid3_hc_rx_sock *ccid3_hc_rx_sk(const struct sock *sk) -- cgit v1.2.3