[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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