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[MX150] Traffic forwarding throughput performance

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Article ID: KB36530 KB Last Updated: 16 Feb 2021Version: 1.0
Summary:
 

This article throws light on traffic forwarding throughput performance in MX150 Series routers before and after PR1531983 and how throughput performance depends on the input traffic frame size.

 

Symptoms:
 

MX150 is essentially NFX250-S2 hardware running vMX software directly on NFX250 hardware. MX150 packet forwarding is performed in software, and is limited to 20 Gbps.

Throughput data is experimentally measured by bidirectional input wire-rate (10GE) traffic.

 

Test Topology

IXIA 10GE port1 ------ xe-0/0/12 MX150 xe-0/0/13 ------ IXIA 10GE port2
 

== MX150 configuration ==

interfaces {
    xe-0/0/12 {
        gigether-options {
            no-flow-control;
        }
        unit 0 {
            family bridge {
                interface-mode access;
                vlan-id 1001;
            }
        }
    }
    xe-0/0/13 {
        gigether-options {
            no-flow-control;
        }
        unit 0 {
            family bridge {
                interface-mode access;
                vlan-id 1001;
            }
        }
    }
}
bridge-domains {
    vlan1001 {
        vlan-id 1001;
    }
}
 

##### Junos OS 19.4R3-S1.3 without fix of PR1531983 #####

--- JUNOS 19.4R3-S1.3 Kernel 64-bit  JNPR-11.0-20201028.e1cef1d_buil
User@mx150> show interfaces xe-0/0/12 extensive
Physical interface: xe-0/0/12, Enabled, Physical link is Up
  Interface index: 159, SNMP ifIndex: 538, Generation: 162
  Link-level type: Ethernet, MTU: 1514, MRU: 1522, LAN-PHY mode, Speed: 10Gbps, Duplex: Full-Duplex,
  BPDU Error: None, Loop Detect PDU Error: None, Ethernet-Switching Error: None,
  MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled
  Pad to minimum frame size: Disabled
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Hold-times     : Up 0 ms, Down 0 ms
  Damping        : half-life: 0 sec, max-suppress: 0 sec, reuse: 0, suppress: 0, state: unsuppressed
  Current address: d8:18:d3:2e:18:0c, Hardware address: d8:18:d3:2e:18:0c
  Last flapped   : 2021-02-12 13:10:19 IST (00:07:34 ago)
  Statistics last cleared: 2021-02-12 13:15:07 IST (00:02:46 ago)
  Traffic statistics:
   Input  bytes  :           9949048500                    0 bps
   Output bytes  :           9964099560                    0 bps
   Input  packets:            165817475                    0 pps
   Output packets:            166068326                    0 pps
   IPv6 transit statistics:
   Input  bytes  :                    0
   Output bytes  :                    0
   Input  packets:                    0
   Output packets:                    0
  Dropped traffic statistics due to STP State:
   Input  bytes  :                    0
   Output bytes  :                    0
   Input  packets:                    0
   Output packets:                    0
  Input errors:
    Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed discards: 0, L3 incompletes: 0,
    L2 channel errors: 0, L2 mismatch timeouts: 0, FIFO errors: 0, Resource errors: 0
  Output errors:
    Carrier transitions: 0, Errors: 0, Drops: 0, Collisions: 0, Aged packets: 0, FIFO errors: 0,
    HS link CRC errors: 0, MTU errors: 0, Resource errors: 0
  Active alarms  : None
  Active defects : None
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0
  Ethernet FEC statistics              Errors
    FEC Corrected Errors                    0
    FEC Uncorrected Errors                  0
    FEC Corrected Errors Rate               0
    FEC Uncorrected Errors Rate             0
  MAC statistics:                      Receive         Transmit
    Total octets                   63999999936      10805426176
    Total packets                    999999999        166068326
    Unicast packets                  999999999        166068326
    Broadcast packets                        0                0
    Multicast packets                        0                0
    CRC/Align errors                         0                0
    FIFO errors                              0                0
    MAC control frames                       0                0
    MAC pause frames                         0          2766458 <<<<<< Pause frames are sent back to the sender
    Oversized frames                         0
    Jabber frames                            0
    Fragment frames                          0
    VLAN tagged frames                       0
    Code violations                          0
    Total errors                             0                0
 

##### Junos 19.4R3-S2.1 with fix of PR1531983 #####

--- JUNOS 19.4R3-S2.1 Kernel 64-bit  JNPR-11.0-20201221.5316c2e_buil
User@mx150> show interfaces xe-0/0/12 extensive
Physical interface: xe-0/0/12, Enabled, Physical link is Up
  Interface index: 159, SNMP ifIndex: 538, Generation: 162
  Link-level type: Ethernet, MTU: 1514, MRU: 1522, LAN-PHY mode, Speed: 10Gbps, Duplex: Full-Duplex,
  BPDU Error: None, Loop Detect PDU Error: None, Ethernet-Switching Error: None,
  MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled
  Pad to minimum frame size: Disabled
  Device flags   : Present Running
  Interface flags: SNMP-Traps Internal: 0x4000
  Link flags     : None
  CoS queues     : 8 supported, 8 maximum usable queues
  Hold-times     : Up 0 ms, Down 0 ms
  Damping        : half-life: 0 sec, max-suppress: 0 sec, reuse: 0, suppress: 0, state: unsuppressed
  Current address: d8:18:d3:2e:18:0c, Hardware address: d8:18:d3:2e:18:0c
  Last flapped   : 2021-02-10 19:18:14 IST (01:44:20 ago)
  Statistics last cleared: 2021-02-10 20:58:37 IST (00:03:57 ago)
  Traffic statistics:
   Input  bytes  :          17776354560                    0 bps
   Output bytes  :          14159163240                    0 bps
   Input  packets:            296272576                    0 pps
   Output packets:            235986054                    0 pps
   IPv6 transit statistics:
   Input  bytes  :                    0
   Output bytes  :                    0
   Input  packets:                    0
   Output packets:                    0
  Dropped traffic statistics due to STP State:
   Input  bytes  :                    0
   Output bytes  :                    0
   Input  packets:                    0
   Output packets:                    0
  Input errors:
    Errors: 0, Drops: 0, Framing errors: 0, Runts: 0, Policed discards: 0, L3 incompletes: 0,
    L2 channel errors: 0, L2 mismatch timeouts: 0, FIFO errors: 0, Resource errors: 0
  Output errors:
    Carrier transitions: 0, Errors: 0, Drops: 0, Collisions: 0, Aged packets: 0, FIFO errors: 0,
    HS link CRC errors: 0, MTU errors: 0, Resource errors: 0
  Active alarms  : None
  Active defects : None
  PCS statistics                      Seconds
    Bit errors                             0
    Errored blocks                         0
  Ethernet FEC statistics              Errors
    FEC Corrected Errors                    0
    FEC Uncorrected Errors                  0
    FEC Corrected Errors Rate               0
    FEC Uncorrected Errors Rate             0
  MAC statistics:                      Receive         Transmit
    Total octets                   63999999936      15103107456
    Total packets                    999999999        235986054
    Unicast packets                  999999999        235986054
    Broadcast packets                        0                0
    Multicast packets                        0                0
    CRC/Align errors                         0                0
    FIFO errors                              0                0
    MAC control frames                       0                0
    MAC pause frames                         0                0 <<<<<< No Pause frames sent
    Oversized frames                         0
    Jabber frames                            0
    Fragment frames                          0
    VLAN tagged frames                       0
    Code violations                          0
    Total errors                             0                0

 

Cause:
 

As stated in the MX150 Hardware Guide, MX150 routers provide 20 Gbps of throughput with 1GE and 10GE interfaces, but the actual throughput performance depends on the input traffic frame size.

Before the problem in PR1531983 was fixed, the no-flow-control configuration knob did not work on MX150 routers as shown above. Even though no-flow-control was set under the gigether-options hierarchy, an overwhelmed MX150 router was seen to send MAC pause frames, which halted the transmission of the sender for a specified period of time.

This software issue caused throughput performance degradation system wide.

After the fix was introduced via PR1531983, MAC pause frames are not sent from the MX150 router if no-flow-control is set as shown above and better throughput performance can be expected.

 

Solution:
 

Throughput performance data depends on the input frame size. After the fix was introduced in PR1531983, we have 20 Gbps system capacity with frame sizes longer than 500B.

 

== Junos 19.4R3-S2.1 ==

Frame length (B)   Throughput (Gbps)
----------------------------------
  64                5
 100                7
 128                9
 200               13
 256               17
 300               19
 512               20
1024               20
1280               20
1518               20

 

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