netdev - Re: [PATCH] tcp: Increase the initial congestion window to 10.

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Message-id: <C9A0E70E-D1DB-45CF-ABB1-8CF9A9D03144@comsys.rwth-aachen.de>
Date:	Fri, 04 Feb 2011 09:38:34 +0100
From:	Alexander Zimmermann <alexander.zimmermann@...sys.rwth-aachen.de>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, dccp@...r.kernel.org, therbert@...gle.com
Subject: Re: [PATCH] tcp: Increase the initial congestion window to 10.

Hi David,

Am 03.02.2011 um 02:07 schrieb David Miller:

> 
> Signed-off-by: David S. Miller <davem@...emloft.net>
> ---
> 
> I've left the DCCP code to keep using RFC3390 logic, if they
> wish to adopt this change in their code they can do so by
> simply deleting the rfc33390_bytes_to_packets() function and
> using TCP_INIT_CWND in their assignment.
> 
> include/net/tcp.h      |   12 +++---------
> net/dccp/ccids/ccid2.c |    9 +++++++++
> net/ipv4/tcp_input.c   |    2 +-
> 3 files changed, 13 insertions(+), 10 deletions(-)
> 
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index 9179111..7118668 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -196,6 +196,9 @@ extern void tcp_time_wait(struct sock *sk, int state, int timeo);
> /* TCP thin-stream limits */
> #define TCP_THIN_LINEAR_RETRIES 6       /* After 6 linear retries, do exp. backoff */
> 

Could you add a reference to draft?

> +/* TCP initial congestion window */
> +#define TCP_INIT_CWND		10
> +
> extern struct inet_timewait_death_row tcp_death_row;
> 
> /* sysctl variables for tcp */
> @@ -799,15 +802,6 @@ static inline __u32 tcp_current_ssthresh(const struct sock *sk)
> /* Use define here intentionally to get WARN_ON location shown at the caller */
> #define tcp_verify_left_out(tp)	WARN_ON(tcp_left_out(tp) > tp->packets_out)
> 
> -/*
> - * Convert RFC 3390 larger initial window into an equivalent number of packets.
> - * This is based on the numbers specified in RFC 5681, 3.1.
> - */
> -static inline u32 rfc3390_bytes_to_packets(const u32 smss)
> -{
> -	return smss <= 1095 ? 4 : (smss > 2190 ? 2 : 3);
> -}
> -
> extern void tcp_enter_cwr(struct sock *sk, const int set_ssthresh);
> extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst);
> 



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