2.4 kern: want to print TCP cwnd with every packet

2.4 kern: want to print TCP cwnd with every packet

[George P Nychis]

Hi,

I'd like to print the TCP cwnd for the sender, with every packet before it is sent out.  This way i could plot the sender window over time to show TCP's behavior in certain conditions.

I see in tcp_input.c several places where i could print the current window, but i'd have to add code in multiple places.  I was wondering if there is any 1 place, right before a packet is sent out, that i could printk() tp->snd_cwnd

Thanks!
George

Re: 2.4 kern: want to print TCP cwnd with every packet

[Stephen Hemminger]

On Sat, 6 May 2006 10:19:16 -0400 (EDT)
"George P Nychis" <gnychis@cmu.edu> wrote:

> Hi,
> 
> I'd like to print the TCP cwnd for the sender, with every packet before it is sent out.  This way i could plot the sender window over time to show TCP's behavior in certain conditions.
> 
> I see in tcp_input.c several places where i could print the current window, but i'd have to add code in multiple places.  I was wondering if there is any 1 place, right before a packet is sent out, that i could printk() tp->snd_cwnd
> 
> Thanks!
> George
> 
> -
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

Look at http://developer.osdl.org/shemminger/prototypes/tcpprobe.tar.gz