Subject: Re: [PATCH] tcp: for tcp westwood implementation

From: Jarek Poplawski <[email-masked]>
Date: Mon, 28 Dec 2009 12:32:02 +0000

On Mon, Dec 28, 2009 at 07:52:23PM +0900, Jae-Hyun Hwang wrote:
> Is it still wrong?
> I hope this patch is successful.

I hope too, but it depends on David. This time it's mostly OK, execept
"Content-Transfer-Encoding: quoted-printable" instead of "inline", as
required by Documentation/SubmittingPatches.

Jarek P.

PS: Btw, don't leave old information after the patch (next time).

> 
> From: Jae-Hyun Hwang <[email-masked]>
> 
> Current net/ipv4/tcp_westwood.c seems to be unnatural when compared
> with Westwood papers.
> Since Linux TCP calls '.ssthresh' interface whenever packet loss is
> detected, it is more natural that the interface points to
> 'tcp_westwood_bw_rttmin' function, not Reno's function.
> This patch also enables Westwood to perform its algorithm when
> CA_EVENT_LOSS event is generated as explained in the papers.
> 
> Signed-off-by: Jae-Hyun Hwang <[email-masked]>
> 
> ---
> 
> --- linux-2.6.32.2/net/ipv4/tcp_westwood.c.orig	2009-12-28
> 13:35:42.000000000 +0900
> +++ linux-2.6.32.2/net/ipv4/tcp_westwood.c	2009-12-28 13:36:54.000000000 +0900
> @@ -232,12 +232,7 @@ static void tcp_westwood_event(struct so
>  		westwood_fast_bw(sk);
>  		break;
> 
> -	case CA_EVENT_COMPLETE_CWR:
> -		tp->snd_cwnd = tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);
> -		break;
> -
>  	case CA_EVENT_FRTO:
> -		tp->snd_ssthresh = tcp_westwood_bw_rttmin(sk);
>  		/* Update RTT_min when next ack arrives */
>  		w->reset_rtt_min = 1;
>  		break;
> @@ -274,9 +269,8 @@ static void tcp_westwood_info(struct soc
> 
>  static struct tcp_congestion_ops tcp_westwood = {
>  	.init		= tcp_westwood_init,
> -	.ssthresh	= tcp_reno_ssthresh,
> +	.ssthresh	= tcp_westwood_bw_rttmin,
>  	.cong_avoid	= tcp_reno_cong_avoid,
> -	.min_cwnd	= tcp_westwood_bw_rttmin,
>  	.cwnd_event	= tcp_westwood_event,
>  	.get_info	= tcp_westwood_info,
>  	.pkts_acked	= tcp_westwood_pkts_acked,
> --
> 
> 
> 
> On Mon, Dec 28, 2009 at 5:43 PM, Jarek Poplawski <[email-masked]> wrote:
> > On 28-12-2009 07:35, Jae-Hyun Hwang wrote:
> >> I'm sorry about posting such a damaged email.
> >> I resubmit the patch by plain-text.
> >
> > Most probably it's still wrong (e.g. no tabs).
> > http://marc.info/?l=linux-netdev&m=126198215600946&q=raw
> >
> > Did you try to send it to yourself?
> >
> > Jarek P.
> >
> >>
> >> On Mon, Dec 28, 2009 at 2:56 PM, David Miller <[email-masked]> wrote:
> >> - Hide quoted text -
> >>> Annyoung-haseyo,
> >>>
> >>> Your patch was damaged by your email client (long lines
> >>> were chopped up with newlines, etc.), as such it is not
> >>> usable.
> >>>
> >>> Please fix this up and resubmit your patch.
> >>>
> >> --
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> >>
> >
> >
> >
> >