[Spread-users] High retrans rate
Martin Decker
mdecker77 at aol.com
Wed Oct 2 06:15:55 EDT 2002
Hi,
I am experiencing a very high retransmission rate when testing spflooder with
1000 byte messages.
sent pack: 1001 recv pack : 6 retrans : 1135
We are evaluating Spread 3.17 in a setup with 1 sender and 2 receivers in the
same LAN. We use a Catalyst 5500 Switch with a static multicast address. The
spread conf looks like:
Spread_Segment 226.0.0.6:4803 {
dev901 195.232.84.170
dev911 195.232.84.188
dev912 195.232.84.189
}
I tested with:
dev912$ ./bin/spflooder -m 1000 -b 1000 -ro
dev911$ ./bin/spflooder -m 1000 -b 1000 -ro
dev901$ ./bin/spflooder -m 1000 -b 1000 -wo
Interesting seems that only one receiver (dev912) needed retrans.
============================
Status at dev901 V 3.17. 0 (state 1, gstate 1) after 29 seconds :
Membership : 3 procs in 1 segments, leader is dev901.lab.aol.de
rounds : 516 tok_hurry : 12 memb change: 1
sent pack: 1001 recv pack : 6 retrans : 1135
u retrans: 8 s retrans : 1127 b retrans : 0
My_aru : 1008 Aru : 1008 Highest seq: 1008
Sessions : 0 Groups : 0 Window : 60
Deliver M: 1000 Deliver Pk: 1008 Pers Window: 15
Delta Mes: 1000 Delta Pack: 1005 Delta sec : 13
==================================
Monitor>
============================
Status at dev912 V 3.17. 0 (state 1, gstate 1) after 26 seconds :
Membership : 3 procs in 1 segments, leader is dev901.lab.aol.de
rounds : 515 tok_hurry : 12 memb change: 1
sent pack: 3 recv pack : 1004 retrans : 156
u retrans: 156 s retrans : 0 b retrans : 0
My_aru : 1008 Aru : 1008 Highest seq: 1008
Sessions : 0 Groups : 0 Window : 60
Deliver M: 1000 Deliver Pk: 1008 Pers Window: 15
Delta Mes: 0 Delta Pack: 0 Delta sec : -3
==================================
Monitor>
============================
Status at dev911 V 3.17. 0 (state 1, gstate 1) after 23 seconds :
Membership : 3 procs in 1 segments, leader is dev901.lab.aol.de
rounds : 515 tok_hurry : 12 memb change: 1
sent pack: 3 recv pack : 1433 retrans : 0
u retrans: 0 s retrans : 0 b retrans : 0
My_aru : 1008 Aru : 1008 Highest seq: 1008
Sessions : 0 Groups : 0 Window : 60
Deliver M: 1000 Deliver Pk: 1008 Pers Window: 15
Delta Mes: 0 Delta Pack: 0 Delta sec : -3
==================================
Changing the parameters of spflooder to "-m 100000 -b 100" resulted in an
acceptable retrans rate:
============================
Status at dev912.lab.aol.de V 3.17. 0 (state 1, gstate 1) after 173 seconds :
Membership : 3 procs in 1 segments, leader is dev901.lab.aol.de
rounds : 33123 tok_hurry : 45 memb change: 2
sent pack: 4 recv pack : 38617 retrans : 122
u retrans: 122 s retrans : 0 b retrans : 0
My_aru : 100008 Aru : 100008 Highest seq: 100008
Sessions : 0 Groups : 0 Window : 60
Deliver M: 100000 Deliver Pk: 100010 Pers Window: 15
Delta Mes: 0 Delta Pack: 0 Delta sec : 15
==================================
Monitor>
============================
Status at dev901.lab.aol.de V 3.17. 0 (state 1, gstate 1) after 177 seconds :
Membership : 3 procs in 1 segments, leader is dev901.lab.aol.de
rounds : 33125 tok_hurry : 45 memb change: 2
sent pack: 37103 recv pack : 7 retrans : 2153
u retrans: 0 s retrans : 2153 b retrans : 0
My_aru : 100008 Aru : 100008 Highest seq: 100008
Sessions : 0 Groups : 0 Window : 60
Deliver M: 100000 Deliver Pk: 100010 Pers Window: 15
Delta Mes: 0 Delta Pack: 0 Delta sec : 4
==================================
Monitor>
============================
Status at dev911.lab.aol.de V 3.17. 0 (state 1, gstate 1) after 168 seconds :
Membership : 3 procs in 1 segments, leader is dev901.lab.aol.de
rounds : 33014 tok_hurry : 41 memb change: 1
sent pack: 3 recv pack : 38745 retrans : 0
u retrans: 0 s retrans : 0 b retrans : 0
My_aru : 100008 Aru : 100008 Highest seq: 100008
Sessions : 0 Groups : 0 Window : 60
Deliver M: 100000 Deliver Pk: 100008 Pers Window: 15
Delta Mes: 0 Delta Pack: 0 Delta sec : -9
Can you confirm such a behaviour?
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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