[Oisf-users] Are kernel_drops a symptom of dysfunctional afpacket fanout and/or RSS?

Cooper F. Nelson cnelson at ucsd.edu
Thu Aug 3 00:05:52 UTC 2017

Try running without any rules enabled.  If you are still dropping
packets it's probably more a system then suricata issue.

If that fixes the problem, it's a suricata issue.  Try running less
rules or adding more cores/threads.  It's *possible* you can address
packet drops on an oversubscribed system by increasing the ring-size per
thread or increasing the max-pending packets setting. 

In either case, make sure the stream bypass is enabled.

This you are using a recent kernel, also try the new tpacket-v3


On 8/2/2017 4:50 PM, Marshall, Hunter wrote:
> I just do not know whether kernel_drops are the/a symptom of these 2
> issues. Details below.

Cooper Nelson
Network Security Analyst
UCSD ITS Security Team
cnelson at ucsd.edu x41042

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