Test with multiple UDP streams on IBM DiffServ

(A.Pinizzotto)

We tested the IBM DiffServ feature with one or more simultaneous UDP streams matching different queues on the router:

best effort
premium
assured

Test overview

Testbed description
Results overview
Router snapshot

Section 1. Testbed description

The network layout is the following:


                 ---------    PPP (2048 kbps)      ---------
                |  IBM    |_______________________|  IBM    |
                |  2212   | 76.1             76.2 |  2216   |
                |         |                       |         |
                 ---------                         ---------
                     | 74.1                            | 75.1
                     |                                 |
    ---------------------------------------------------------------------
              | 74.2        fast ethernet                       | 75.2
              |                                                 |
           -------                                           -------
          |       |                                         |       |
          |   A   |                                         |   B   |
           -------                                           -------

Routing:

packets from A to B are routed through router 2212 and 2216.
packets from B to A are routed through router 2216 and 2212.

A is the stream source, B is the sink.
All of the 3 traffic sources send packets at a rate of 2048 kbps, including the overhead. This is generted by a stram of 246 packets/sec, with packets of 1000 (udp data) + 20 (udp header) + 20 (ip header)
DiffServ is configured only on the IBM 2212 router for outgoing traffic from the ppp interface.
Bandwidths assigned to the diffserv queues are:

premium: 163.8 kbps (8% of PPP int. Bandwidth)
assured: 819.2 kbps (40% of PPP int. Bandwidth)

We run 7 different tests:

Only Best Effort
Only Assured
Only Premium
Best Effort + Assured
Best effort + Premium
Assured + Premium
Best Effort + Assured + Premium

Tests lasted for 30 sec.

Definitions on IBM router:


Policies:
----------------------------------------------
Policy Name     = ds_udp_74.2->75.2:10          
        State:Priority =Enabled    : 10
        Profile        =udp_74.2->75.2:10
        Valid Period   =val_always
        DiffServ Action=ds1_prem8
        
Policy Name     = ds_udp_74.2->75.2:20          
        State:Priority =Enabled    : 10
        Profile        =udp_74.2->75.2:20
        Valid Period   =val_always
        DiffServ Action=ds_ass40
----------------------------------------------


Profiles:
----------------------------------------------
Profile Name    = udp_74.2->75.2:10             
        sAddr     =   192.168.74.2 :  sPort=    0 : 65535
        dAddr     =   192.168.75.2 :  dPort=60010 : 60010
        proto     =             17 : 17   
        TOS       =            xFF : x00
        Remote Grp=All Users                     
        
Profile Name    = udp_74.2->75.2:20             
        sAddr     =   192.168.74.2 :  sPort=    0 : 65535
        dAddr     =   192.168.75.2 :  dPort=60020 : 60020
        proto     =             17 : 17   
        TOS       =            xFF : x00
        Remote Grp=All Users  
----------------------------------------------


Diff-serv actions:
----------------------------------------------
DiffServ Name   = ds1_prem8                      Type =Permit              
        TOS mask:modify=xFF:x01
        Queue:BwShare  =Premium    : 8 %
        
DiffServ Name   = ds_ass40                       Type =Permit              
        TOS mask:modify=xFF:x04
        Queue:BwShare  =Assured    : 40 %
----------------------------------------------


Interface diffsev parameters:
-------------------------------------------------------------------------------
                        ---------- Premium -------   --------- Assured --------
Net If     Status  NumQ Bwdth  Wght  OutBuf  MaxQos Bwdth  Wght  OutBuf  MaxQos
Num                       (%)   (%) (bytes)     (%)   (%)   (%) (bytes)     (%)
-------------------------------------------------------------------------------
0   PPP   Enabled     2    20    90    5500      95    80    10   27500      80
-------------------------------------------------------------------------------

MGEN and DREC commands used:
TRAFFIC SOURCE (source host 192.168.74.2) --script-- mgen -i ge0 -b 192.168.75.2:60000 -s 1000 -r 246 -p 60000 -d 30 & mgen -i ge0 -b 192.168.75.2:60010 -s 1000 -r 246 -p 60010 -d 30 & mgen -i ge0 -b 192.168.75.2:60020 -s 1000 -r 246 -p 60020 -d 30 & ----------
(depending on the particular test we used one or more of these lines.)
TRAFFIC RECEIVER 3 different windows: (dest host 192.168.75.2) drec -b 192.168.74.2 -i ge0 -p 60000 logfile_0 mcalc logfile_0 drec -b 192.168.74.2 -i ge0 -p 60010 logfile_1 mcalc logfile_1 drec -b 192.168.74.2 -i ge0 -p 60020 logfile_2 mcalc logfile_2

Section 2. Results overview
All of the traffic sources send packets at a bit rate of 2048 kbps, including header overhead. In this table throughputs are in kbps and don't include the header overhead (MCALC result).
---------------------------------------------------------------------------------------- test | streams | BE | Assured | Premium || Total | | | throughput | throughput | throughput || throughput | ---------------------------------------------------------------------------------------- 1 | BE | 1967.754 | ---- | ---- || 1967.754 | ---------------------------------------------------------------------------------------- 2 | Assured | ---- | 1968.010 | ---- || 1968.010 | ---------------------------------------------------------------------------------------- 3 | Premium | ---- | ---- | 159.858 || 159.858 | ---------------------------------------------------------------------------------------- 4 | BE + Assured | 649.833 | 1367.020 | ---- || 2016.853 | ---------------------------------------------------------------------------------------- 5 | BE + Premium | 1852.470 | ---- | 159.837 || 2012.307 | ---------------------------------------------------------------------------------------- 6 | Assured + Premium | ---- | 1852.014 | 159.837 || 2011.851 | ---------------------------------------------------------------------------------------- 7 | BE + Assured + Premium | 617.807 | 1236.945 | 159.858 || 2014.610 | ----------------------------------------------------------------------------------------

Section 3. Details on results
In this section details are reported about the packets managed by the diffserv process on the IBM router. The command to obtain it is:
talk 5 -> feature ds -> list stream 4 0

Output Legenda: Id stream identificator number t stream type D DiffServ stream B Best Effort stream C network control stream I/o q Queue type q1 Premium queue q2 Assured/BE queue allo/cur(K) Total buffer space (in Kbytes) allocated by this stream tot pkt Total packets received for transmission by this stream tot Kby Total kilobytes received for transmission by this stream pkt snt Total packets sent by this stream Kby snt Total kilobytes sent by this stream ovr snt Number of packets sent using shared buffers buf drp Number of packets dropped from this stream because no buffer space was available policed Number of packets dropped by the policer on the premium queue

TEST 1) Only Best Effort
Streams from net 4 to net 0: Id t I/o q allo/cur(K) tot pkt tot Kby pkt snt Kby snt ovr snt buf drp policed ---- - ----- ----------- ------- ------- ------- ------- ------- ------- ------- (ds_udp_74.2->75.2:20) 87 D in 0.0/ 0.0 0 0 0 0 0 0 o-q2 0.0/ 0.0 0 0 0 0 0 (ds_udp_74.2->75.2:10) 86 D in 0.0/ 0.0 0 0 0 0 0 0 o-q1 0.0/ 0.0 0 0 0 0 0 (-) 11 B in 0.0/ 0.0 7381 7617 7381 7617 7381 0 o-q2 2.8/ 0.0 7381 7617 7129 0 0 (-) 4 C in 0.0/ 0.0 0 0 0 0 0 0 o-q2 1.4/ 0.0 0 0 0 0 0

TEST 2) Only Assured
Streams from net 4 to net 0: Id t I/o q allo/cur(K) tot pkt tot Kby pkt snt Kby snt ovr snt buf drp policed ---- - ----- ----------- ------- ------- ------- ------- ------- ------- ------- (ds_udp_74.2->75.2:20) 87 D in 13.8/ 0.0 7381 7617 7381 7617 205 0 o-q2 13.8/ 0.0 7381 7617 205 0 0 (ds_udp_74.2->75.2:10) 86 D in 0.0/ 0.0 0 0 0 0 0 0 o-q1 0.0/ 0.0 0 0 0 0 0 (-) 11 B in 0.0/ 0.0 0 0 0 0 0 0 o-q2 2.8/ 0.0 0 0 0 0 0 (-) 4 C in 0.0/ 0.0 0 0 0 0 0 0 o-q2 1.4/ 0.0 0 0 0 0 0

TEST 3) Only Premium
Streams from net 4 to net 0: Id t I/o q allo/cur(K) tot pkt tot Kby pkt snt Kby snt ovr snt buf drp policed ---- - ----- ----------- ------- ------- ------- ------- ------- ------- ------- (ds_udp_74.2->75.2:20) 87 D in 0.0/ 0.0 0 0 0 0 0 0 o-q2 0.0/ 0.0 0 0 0 0 0 (ds_udp_74.2->75.2:10) 86 D in 0.0/ 0.0 7381 7617 599 618 21 0 o-q1 0.0/ 0.0 599 618 21 0 6782 (-) 11 B in 0.0/ 0.0 0 0 0 0 0 0 o-q2 2.8/ 0.0 0 0 0 0 0 (-) 4 C in 0.0/ 0.0 0 0 0 0 0 0 o-q2 1.4/ 0.0 0 0 0 0 0

TEST 4) Best Effort + Assured
Streams from net 4 to net 0: Id t I/o q allo/cur(K) tot pkt tot Kby pkt snt Kby snt ovr snt buf drp policed ---- - ----- ----------- ------- ------- ------- ------- ------- ------- ------- (ds_udp_74.2->75.2:20) 87 D in 13.8/ 0.0 7381 7617 5133 5297 3373 0 o-q2 13.8/ 0.0 5133 5297 3373 2248 0 (ds_udp_74.2->75.2:10) 86 D in 0.0/ 0.0 0 0 0 0 0 0 o-q1 0.0/ 0.0 0 0 0 0 0 (-) 11 B in 0.0/ 0.0 7381 7617 2441 2519 2441 0 o-q2 2.8/ 0.0 2441 2519 2439 4940 0 (-) 4 C in 0.0/ 0.0 0 0 0 0 0 0 o-q2 1.4/ 0.0 0 0 0 0 0

TEST 5) Best Effort + Premium
Streams from net 4 to net 0: Id t I/o q allo/cur(K) tot pkt tot Kby pkt snt Kby snt ovr snt buf drp policed ---- - ----- ----------- ------- ------- ------- ------- ------- ------- ------- (ds_udp_74.2->75.2:20) 87 D in 0.0/ 0.0 0 0 0 0 0 0 o-q2 0.0/ 0.0 0 0 0 0 0 (ds_udp_74.2->75.2:10) 86 D in 8.0/ 0.0 7381 7617 599 618 5 0 o-q1 8.0/ 0.0 599 618 5 0 6782 (-) 11 B in 0.0/ 0.0 7381 7617 6954 7176 6954 0 o-q2 2.8/ 0.0 6954 7176 6952 427 0 (-) 4 C in 0.0/ 0.0 0 0 0 0 0 0 o-q2 1.4/ 0.0 0 0 0 0 0

TEST 6) Assured + Premium
Streams from net 4 to net 0: Id t I/o q allo/cur(K) tot pkt tot Kby pkt snt Kby snt ovr snt buf drp policed ---- - ----- ----------- ------- ------- ------- ------- ------- ------- ------- (ds_udp_74.2->75.2:20) 87 D in 13.8/ 0.0 7381 7617 6955 7177 6845 0 o-q2 13.8/ 0.0 6955 7177 6845 426 0 (ds_udp_74.2->75.2:10) 86 D in 8.0/ 0.0 7381 7617 599 618 12 0 o-q1 8.0/ 0.0 599 618 12 0 6782 (-) 11 B in 0.0/ 0.0 0 0 0 0 0 0 o-q2 2.8/ 0.0 0 0 0 0 0 (-) 4 C in 0.0/ 0.0 0 0 0 0 0 0 o-q2 1.4/ 0.0 0 0 0 0 0

TEST 7) Best Effort + Assured + Premium
Streams from net 4 to net 0: Id t I/o q allo/cur(K) tot pkt tot Kby pkt snt Kby snt ovr snt buf drp policed ---- - ----- ----------- ------- ------- ------- ------- ------- ------- ------- (ds_udp_74.2->75.2:20) 87 D in 13.8/ 0.0 7381 7617 4647 4795 3324 0 o-q2 13.8/ 0.0 4647 4795 3324 2734 0 (ds_udp_74.2->75.2:10) 86 D in 8.0/ 0.0 7381 7617 599 618 12 0 o-q1 8.0/ 0.0 599 618 12 0 6782 (-) 11 B in 0.0/ 0.0 7381 7617 2321 2395 2321 0 o-q2 2.8/ 0.0 2321 2395 2319 5060 0 (-) 4 C in 0.0/ 0.0 0 0 0 0 0 0 o-q2 1.4/ 0.0 0 0 0 0 0
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