[Spread-users] High retrans rate

Martin Decker mdecker77 at aol.com
Wed Oct 2 07:16:34 EDT 2002


I can find the r.c and s.c files in the source, but they are not compiled 
during ./configure and make. Is that correct? How are they compiled?

Martin


Am Mittwoch, 2. Oktober 2002 13:03 schrieben Sie:
> Martin,
>
> It seems to me that your multicast address does not work well and therefore
> both your receivers loose most packets (any time you see sretrans that
> means that the message had to be retransmited using multicast - which means
> that both receivers missed it).
>
> There are two programs "s" and "r" that we give with the distribution.
> Build them and try running s for sender and r for receiver using the
> 226.0.0.6 and see what happens. s and r are just helping you to
> measure the network behavior using native udp without Spread.
>
>         Cheers,
>
>         :) Yair.
>
> Martin> Hi,
>
> Martin> I am experiencing a very high retransmission rate when testing
> spflooder with Martin> 1000 byte messages.
>
> Martin> sent pack:    1001      recv pack :       6     retrans    :   
> 1135
>
> Martin> We are evaluating Spread 3.17 in a setup with 1 sender and 2
> receivers in the Martin> same LAN. We use a Catalyst 5500 Switch with a
> static multicast address. The Martin> spread conf looks like:
>
>
> Martin> Spread_Segment 226.0.0.6:4803 {
> Martin>     dev901      195.232.84.170
> Martin>     dev911      195.232.84.188
> Martin>     dev912      195.232.84.189
> Martin> }
>
> Martin> I tested with:
> Martin> dev912$  ./bin/spflooder -m 1000 -b 1000 -ro
> Martin> dev911$  ./bin/spflooder -m 1000 -b 1000 -ro
> Martin> dev901$  ./bin/spflooder -m 1000 -b 1000 -wo
>
> Martin> Interesting seems that only one receiver (dev912) needed retrans.
>
> Martin> ============================
> Martin> Status at dev901 V 3.17. 0 (state 1, gstate 1) after 29 seconds :
> Martin> Membership  :  3  procs in 1 segments, leader is dev901.lab.aol.de
> Martin> rounds   :     516      tok_hurry :      12     memb change:      
> 1 Martin> sent pack:    1001      recv pack :       6     retrans    :   
> 1135 Martin> u retrans:       8      s retrans :    1127     b retrans  :  
>     0 Martin> My_aru   :    1008      Aru       :    1008     Highest seq: 
>   1008 Martin> Sessions :       0      Groups    :       0     Window     :
>      60 Martin> Deliver M:    1000      Deliver Pk:    1008     Pers
> Window:      15 Martin> Delta Mes:    1000      Delta Pack:    1005    
> Delta sec  :      13 Martin> ==================================
>
> Monitor>>
> Martin> ============================
> Martin> Status at dev912 V 3.17. 0 (state 1, gstate 1) after 26 seconds :
> Martin> Membership  :  3  procs in 1 segments, leader is dev901.lab.aol.de
> Martin> rounds   :     515      tok_hurry :      12     memb change:      
> 1 Martin> sent pack:       3      recv pack :    1004     retrans    :    
> 156 Martin> u retrans:     156      s retrans :       0     b retrans  :   
>    0 Martin> My_aru   :    1008      Aru       :    1008     Highest seq:  
>  1008 Martin> Sessions :       0      Groups    :       0     Window     : 
>     60 Martin> Deliver M:    1000      Deliver Pk:    1008     Pers Window:
>      15 Martin> Delta Mes:       0      Delta Pack:       0     Delta sec 
> :      -3 Martin> ==================================
>
> Monitor>>
> Martin> ============================
> Martin> Status at dev911 V 3.17. 0 (state 1, gstate 1) after 23 seconds :
> Martin> Membership  :  3  procs in 1 segments, leader is dev901.lab.aol.de
> Martin> rounds   :     515      tok_hurry :      12     memb change:      
> 1 Martin> sent pack:       3      recv pack :    1433     retrans    :     
>  0 Martin> u retrans:       0      s retrans :       0     b retrans  :    
>   0 Martin> My_aru   :    1008      Aru       :    1008     Highest seq:   
> 1008 Martin> Sessions :       0      Groups    :       0     Window     :  
>    60 Martin> Deliver M:    1000      Deliver Pk:    1008     Pers Window: 
>     15 Martin> Delta Mes:       0      Delta Pack:       0     Delta sec  :
>      -3 Martin> ==================================
>
>
> Martin> Changing the parameters of spflooder to "-m 100000 -b 100" 
> resulted in an Martin> acceptable retrans rate:
>
> Martin> ============================
> Martin> Status at dev912.lab.aol.de V 3.17. 0 (state 1, gstate 1) after 173
> seconds : Martin> Membership  :  3  procs in 1 segments, leader is
> dev901.lab.aol.de Martin> rounds   :   33123      tok_hurry :      45    
> memb change:       2 Martin> sent pack:       4      recv pack :   38617   
>  retrans    :     122 Martin> u retrans:     122      s retrans :       0  
>   b retrans  :       0 Martin> My_aru   :  100008      Aru       :  100008 
>    Highest seq:  100008 Martin> Sessions :       0      Groups    :       0
>     Window     :      60 Martin> Deliver M:  100000      Deliver Pk: 
> 100010     Pers Window:      15 Martin> Delta Mes:       0      Delta Pack:
>       0     Delta sec  :      15 Martin> ==================================
>
> Monitor>>
> Martin> ============================
> Martin> Status at dev901.lab.aol.de V 3.17. 0 (state 1, gstate 1) after 177
> seconds : Martin> Membership  :  3  procs in 1 segments, leader is
> dev901.lab.aol.de Martin> rounds   :   33125      tok_hurry :      45    
> memb change:       2 Martin> sent pack:   37103      recv pack :       7   
>  retrans    :    2153 Martin> u retrans:       0      s retrans :    2153  
>   b retrans  :       0 Martin> My_aru   :  100008      Aru       :  100008 
>    Highest seq:  100008 Martin> Sessions :       0      Groups    :       0
>     Window     :      60 Martin> Deliver M:  100000      Deliver Pk: 
> 100010     Pers Window:      15 Martin> Delta Mes:       0      Delta Pack:
>       0     Delta sec  :       4 Martin> ==================================
>
> Monitor>>
> Martin> ============================
> Martin> Status at dev911.lab.aol.de V 3.17. 0 (state 1, gstate 1) after 168
> seconds : Martin> Membership  :  3  procs in 1 segments, leader is
> dev901.lab.aol.de Martin> rounds   :   33014      tok_hurry :      41    
> memb change:       1 Martin> sent pack:       3      recv pack :   38745   
>  retrans    :       0 Martin> u retrans:       0      s retrans :       0  
>   b retrans  :       0 Martin> My_aru   :  100008      Aru       :  100008 
>    Highest seq:  100008 Martin> Sessions :       0      Groups    :       0
>     Window     :      60 Martin> Deliver M:  100000      Deliver Pk: 
> 100008     Pers Window:      15 Martin> Delta Mes:       0      Delta Pack:
>       0     Delta sec  :      -9
>
>
> Martin> Can you confirm such a behaviour?
>
> Martin> Martin

-- 
// Martin Decker, Systems Engineer, Data Center Operations     //
// AOL Germany, Dingolfinger-Str. 2-4, D-81673 Munich, Germany //
// AIM: mdecker77 mail: mdecker77 at aol.com ICQ: 15620821        //
// Phone:+49.8966572214                                        //





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