carp HA performance issue

netblues

I'm seeing a rather strange issue

Two virtualized pf+ on 24.11
Two vlan interfaces with mtu set at 1400 bytes Physical interface is 1Gbit ethernet
192.168.125.3 and 192.168.125.4

One carp vip @ 192.168.125.1, unicasted
Everything works as expected, except iperf performance incoming through the carp suffers
(οr terminating to the carp, doesn't really matter)

Running iperf to the interface ip (192.168.125.3) I get ~ 930Mbits, as expected, both ways.
Running iperf to the carp ip (192.168.125.1) I still get ~930Mbits egress from pf. and ONLY 9.4Mbits ingress
Some happens if I iperf to a host routed behind pfsense.
Routing via 125.1 (carp) incoming @9.4 Mbits
Routing via 125.3 (interface ip) incoming @930Mbits
outgoing is always @930Mbits

Any ideas/pointers more than welcome

Looks like carp interface is @10Mbits for ingress traffic.
mtu is correct, and I don't see any obvious errors.

SteveITS

@netblues the shared IP isn't its own interface or speed.

Is the master/backup status correct for all IPs on both routers?

netblues

@SteveITS
I 'm fully aware that a virtual ip doesn't have its own interface etc.
It just BEHAVES as if it had one.

obviously , yes carp is operating correctly.