Reason for CPU spike during file transfer
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Curious as to why the CPU utilization shot up.
Background: I was pulling some movies from a friend's SFTP server over the internet (not through a VPN). While downloading multiple movies using Filezilla (where i can only download 2 movies simultaneously at a time) I noticed that CPU usage increased dramatically during the transfer. No harm to the overall network during this time but i am wondering why was the CPU even stressed. No VPN is used for this file transfer. As far as the firewall is concerned this is just plain old packets going back and forth - no encryption.
edit: I may have found the culprit...Suricata is running on the Server VLAN. Pretty sure that is what the cause was. Grrrr shouldve done a better job checking what i had configured.
I am running a Netgate 6100.
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I mean I would expect to see increased CPU usage when passing traffic. But that does look higher than expected. Suricata running on that traffic would explain it though as you say.
