"Quote from: elvinmammadov on July 17, 2026, 08:30:42 PMHello,
We upgraded our OPNsense firewall from 25.7 to 26.1.11_10 and noticed a significant increase in memory usage immediately after the upgrade.
System specifications:
OPNsense 26.1.11_10
8 GB RAM
Before the upgrade, total memory usage was typically around 20–30%. After the upgrade, it increased to around 76–90%.
To troubleshoot the issue, I disabled the HostWatch service, which reduced memory usage from approximately 90% to 78% Basketball Bros, but it is still much higher than before the upgrade.
According to the top output, the Suricata process is consuming approximately 5.8 GB of resident memory, making it the largest contributor to the overall RAM usage.
Has anyone experienced similar behavior after upgrading to 26.1.11_10?
Hi Elvin,
I saw the same thing after upgrading to 26.1. In my case, Suricata was the main culprit, not the firewall itself. I disabled IPS temporarily, restarted Suricata, and the memory usage dropped back to normal. Re-enabling it with fewer rules fixed the problem for me. I'd try that before focusing too much on HostWatch.
