High ping loss rate while using bonding

RouterOS General
1

I have create a bonding interface on 2 routers

/interface bonding
add arp=enabled arp-interval=100ms disabled=no \
    down-delay=0ms lacp-rate=30secs link-monitoring=mii mii-interval=100ms \
    mode=balance-rr mtu=1500 name=bonding1 primary=none slaves=ether2,ether3 \
    transmit-hash-policy=layer-2 up-delay=0ms

And I have assigned IP on the bonding interface of each router.

When I try to ping the bonding interface of the opposite router, the ping loss rate is very high: ~80-90%

I am testing them in KVM with 2 bridges for each ethernet connection.

Any hints?

Thanks.

2

at the level of L1 exactly all right?
If no EtherChanel use links that no loss?

convolution configuration on both routers.

Try mode = 802.3ad
see also CPU load