601.423468 [3911] netmap_transmit em1 full hwcur 222 hwtail 155 qlen 66

[tbird7383]

Getting a lot of those errors on em1. Not happening on em0.

Is this IDS/IPS related?
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[Supermule]

Yes. Its netmap related to Suricata Inline mode.

I have the same but only under heavy load. Its like the NIC cant handle the traffic when Suricata interceps the packets.