From: Neal Cardwell Date: Mon, 30 Jun 2014 19:09:49 +0000 (-0400) Subject: tcp: switch snt_synack back to measuring transmit time of first SYNACK X-Git-Tag: omap-for-v3.17/fixes-against-rc2~149^2~228 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86c6a2c75ab97fe31844985169e26aea335432f9;p=pandora-kernel.git tcp: switch snt_synack back to measuring transmit time of first SYNACK Always store in snt_synack the time at which the server received the first client SYN and attempted to send the first SYNACK. Recent commit aa27fc501 ("tcp: tcp_v[46]_conn_request: fix snt_synack initialization") resolved an inconsistency between IPv4 and IPv6 in the initialization of snt_synack. This commit brings back the idea from 843f4a55e (tcp: use tcp_v4_send_synack on first SYN-ACK), which was going for the original behavior of snt_synack from the commit where it was added in 9ad7c049f0f79 ("tcp: RFC2988bis + taking RTT sample from 3WHS for the passive open side") in v3.1. In addition to being simpler (and probably a tiny bit faster), unconditionally storing the time of the first SYNACK attempt has been useful because it allows calculating a performance metric quantifying how long it took to establish a passive TCP connection. Signed-off-by: Neal Cardwell Signed-off-by: Yuchung Cheng Cc: Octavian Purdila Cc: Jerry Chu Acked-by: Octavian Purdila Signed-off-by: David S. Miller --- Reading git-diff-tree failed