Hey everyone,
I'm currently using the NAT64 plugin in VPP and am experiencing severe latency
issues when connecting to IPv6→IPv4 destinations. As shown below, throughput is
extremely low and packet retransmissions are high:
iperf3 -c spd-uswb.hostkey.com -p 5205
Connecting to host spd-uswb.hostkey.com, port 5205
[ 5] local 2604:2dc0:400:c001:0:2:0:1c port 40092 connected to
64:ff9b::8b3c:a058 port 5205
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 58.6 KBytes 480 Kbits/sec 24 2.79 KBytes
[ 5] 1.00-2.00 sec 68.3 KBytes 560 Kbits/sec 9 6.97 KBytes
[ 5] 2.00-3.00 sec 41.8 KBytes 343 Kbits/sec 12 4.18 KBytes
[ 5] 3.00-4.00 sec 85.1 KBytes 697 Kbits/sec 8 4.18 KBytes
[ 5] 4.00-5.00 sec 40.4 KBytes 331 Kbits/sec 8 4.18 KBytes
[ 5] 5.00-6.00 sec 41.8 KBytes 343 Kbits/sec 7 5.58 KBytes
[ 5] 6.00-7.00 sec 41.8 KBytes 343 Kbits/sec 8 5.58 KBytes
[ 5] 7.00-8.00 sec 40.4 KBytes 331 Kbits/sec 8 5.58 KBytes
[ 5] 8.00-9.00 sec 83.7 KBytes 686 Kbits/sec 9 1.39 KBytes
[ 5] 9.00-10.00 sec 41.8 KBytes 343 Kbits/sec 7 1.39 KBytes
-
[ 5] 0.00-10.00 sec 544 KBytes 446 Kbits/sec 100 sender
[ 5] 0.00-10.04 sec 483 KBytes 394 Kbits/sec receiver
When running IPv6→IPv6 traffic, I can easily achieve >1 Gbps throughput, so the
issue appears specific to NAT64 processing. I'm not sure what might be causing
the degradation and would appreciate any pointers to help diagnose or resolve
this.
For reference, here is my VPP configuration (v25.10):
unix {
nosyslog
nodaemon
log /var/log/vpp/vpp.log
full-coredump
cli-listen /run/vpp/cli.sock
startup-config /etc/vpp/setup.gate
}
vhost-user {
dont-dump-memory
}
api-trace {
on
}
statseg {
size 1024M
per-node-counters on
}
socksvr {
default
socket-name /run/vpp/api.sock
}
cpu {
main-core 4
corelist-workers 5-6,68-71
}
buffers {
buffers-per-numa 256000
page-size 1G
}
dpdk {
log-level notice
dev 0000:81:00.0
}
memory {
main-heap-size 16G
main-heap-page-size 1G
default-hugepage-size 1G
}
ip6 {
heap-size 4G
hash-buckets 2097152
}
punt {
socket /run/vpp/punt.sock
}
plugins {
plugin default { enable }
plugin dpdk_plugin.so { enable }
plugin nat_plugin.so { enable }
plugin acl_plugin.so { enable }
plugin memif_plugin.so { enable }
plugin cdp_plugin.so { disable }
plugin gtpu_plugin.so { disable }
plugin l2e_plugin.so { disable }
plugin igmp_plugin.so { disable }
plugin stn_plugin.so { disable }
}
logging {
default-log-level info
default-syslog-log-level notice
class dpdk { rate-limit 100 level notice }
class interface { rate-limit 1000 level info }
class nat { rate-limit 100 level info }
}
Thanks in advance for any guidance!
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