linux-kernel - Re: [PATCH] tcp: Lower the initial RTO to 1s as per draft RFC 2988bis-02.

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Message-Id: <20110519.161613.660024399062254005.davem@davemloft.net>
Date:	Thu, 19 May 2011 16:16:13 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	tsunanet@...il.com
Cc:	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net, hagen@...u.net,
	eric.dumazet@...il.com, alexander.zimmermann@...sys.rwth-aachen.de,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tcp: Lower the initial RTO to 1s as per draft RFC
 2988bis-02.

From: Benoit Sigoure <tsunanet@...il.com>
Date: Wed, 18 May 2011 23:47:49 -0700

> @@ -868,6 +868,11 @@ static void tcp_init_metrics(struct sock *sk)
>  {
>  	struct tcp_sock *tp = tcp_sk(sk);
>  	struct dst_entry *dst = __sk_dst_get(sk);
> +	/* If we had to retransmit anything during the 3WHS, use
> +	 * the initial fallback RTO as per draft RFC 2988bis-02.
> +	 */
> +	int init_rto = inet_csk(sk)->icsk_retransmits ?
> +		TCP_TIMEOUT_INIT_FALLBACK : TCP_TIMEOUT_INIT;

Please do not put comments in the middle of a set of function
local variable declarations.

Also, as mentioned already, icsk_retransmits is not where SYN
retransmissions are counted.

It is stored in the TCP minisocket ->retrans field.
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