[Spread-users] Token Message

[Yuval Lifshitz]

In the lab I have the following setup:

Spread_Segment  10.10.0.255:4803 {
        P1                  10.10.0.180
}

Spread_Segment  172.16.0.255:4803 {
        P2                 172.16.0.129
        P3                 172.16.0.126
}

Setup is identical on all 3 machines. Each segment is
on different LAN, connected through a router.
I have ~0.05msec latency within the LAN and ~0.6msec
latency across the router (according to ping rtt/2).
Field deployment will have similar characteristics
only with more segments (all connected to a private
backbone) and more daemons in each segment.


--- Yair Amir <yairamir at cnds.jhu.edu> wrote:

> Hi Yuval,
> 
> Spread has some heuristic to understand your network
> and that does not work
> always well for people who use local addresses (e.g.
> addresses such as 192.168.0.x,
> 192.168.1.x ..). In such a case, there will be a
> change you will need to
> do manually that may improve things.
> 
> E-mail your configuration file and we'll be able to
> comment. Explain also the
> latencies between the segments (and how they are
> connected).
> Cheers,
> 
> 	:) Yair.
> 
> 
> Yuval Lifshitz wrote:
> > I have a spread network with two segments, one
> with
> > two daemons and one with one.
> > All is working fine except that for each message I
> > send through spread there are about 25 extra
> messages
> > sent between the daemons. These are small token
> > messages (most are token hurry) messages, but this
> 25
> > factor (with my high rate of messages) flood my
> > network.
> > 
> > Spread is compiled with:
> > Token_timeout.sec  =  20
> > Hurry_timeout.sec  =   6
> > in the wide configuration the daemons use.
> > Is that a known problem or configuration problem?
> > 
> > I tried to investigate the code and saw that the
> token
> > messages is sent in many places (sometimes twice
> in
> > the same place), so I tried to impose the
> > "Hurry_timeout" in an ugly way in the code, in
> > network.c I added:
> > 
> > #include <sys/time.h>
> > ext	sp_time		Hurry_timeout;
> > 
> > int	Net_send_token( sys_scatter *scat )
> > {
> > 	struct timeval now = {0 ,0};
> > 	static struct timeval last = {0 ,0};
> > 	token_header	*token_ptr;
> > 	int		ret;
> > 
> > 	gettimeofday(&now, NULL);
> > 	
> > 	if (now.tv_sec - last.tv_sec < Hurry_timeout.sec)
> > 	{
> >                  printf("too much tokens, time
> diff
> > from last is: %ld\n", now.tv_sec - last.tv_sec);
> > 		return 0;
> > 	}
> > 	
> > 	last.tv_sec = now.tv_sec;
> > ...
> > 
> > Is that bad as I think it is?
> > 
> > Yuval.
> > 
> > 
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> > _______________________________________________
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> > Spread-users at lists.spread.org
> >
>
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> > 
> > 
> 
> 
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>
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> 


		
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