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Hi,
we are running lvs for couple of years and upgraded last month to 10G
infrastructure.
Now, we ran into some kind of performance issues:
Everything works fine until we reach at througput of 1600-2000Mbit/s and
193.906 pkt/s OUT 117.898 pkt/s IN
Then we run into the following situation:
CPU load average increases up to 22,
CPU Utilization increase up to 60%
Interface counter shows growing paket drops/discards
Setup: lvs-nat with WLC and session-persistence 60s, ubuntu 18.04 LTS,
HW is Dual-Socket 2x 12 core xeon GOLD 6146 @ 3,2GHz with
Hyperthreading enabled,
The loadbalancer is used to balance VPN UDP nat-t connections only (UDP
500/4500)
I found some article about performance issues with ip_conntrack.
On the system nf_conntrack is loaded and (apperntly) used by ip_vs.
/proc/sys/net/ipv4/vs/conntrack is set to 0
It looks like that some kind of table (nf?) reaches limitation.
Any suggestions to improve performance and/or fix this issue=
Thanks a lot.
regards Marco
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