netdev - Re: TCP's initial cwnd setting correct?...

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Date:	Tue, 07 Aug 2007 18:28:23 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	netdev@...r.kernel.org
Subject: Re: TCP's initial cwnd setting correct?...

From: "Ilpo_Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Mon, 6 Aug 2007 15:37:15 +0300 (EEST)

> @@ -805,13 +805,13 @@ void tcp_update_metrics(struct sock *sk)
>  	}
>  }
>  
> -/* Numbers are taken from RFC2414.  */
> +/* Numbers are taken from RFC3390.  */
>  __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst)
>  {
>  	__u32 cwnd = (dst ? dst_metric(dst, RTAX_INITCWND) : 0);
>  
>  	if (!cwnd) {
> -		if (tp->mss_cache > 1460)
> +		if (tp->mss_cache >= 2190)
>  			cwnd = 2;
>  		else
>  			cwnd = (tp->mss_cache > 1095) ? 3 : 4;

I remember suggesting something similar about 5 or 6 years
ago and Alexey Kuznetsov at the time explained the numbers
which are there and why they should not be changed.

I forget the reasons though, and I'll try to do the research.

These numbers have been like this forever, FWIW.
-
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