device : 300C
There were some packets had been lossed.I found a tip that explain how it happed.
When the the 3rd tcp handshake packet ('ack') get handle by CPU (slow path), the 1st data would already get accelerate by Network Processor (fast path) and will increase possibility to trigger TCP out of order between these 2 packets.
Under what circumstances will packets be processed by the CPU instead of being accelerated by the network processor?
Will it happen when the network processor accelerates to full load? Can you please tell me the specifications for network processor acceleration? Because my device is too old, it is NP4, and the command
config firewall polic
edit <>
set delay-tcp-npu-session enable
does not support it
Is there any other solution to alleviate packet loss?
Please tell me,thank you very much.
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Hi Asda
As per my knowledge (not exhaustive), the CPU will handle the packets in these cases:
In case you suspect this symptom, you can try disable NPU offload in the affected policy and see if it helps.
config firewall policy
edit X
set auto-asic-offload disable
end
Created on 03-22-2024 07:39 PM Edited on 03-22-2024 07:47 PM
Hi AEK
Thank for your advice.I will try this method.
And do you know that NPU is enabled by default?
And is there any commons that will show how much NPU used, just like
get sys perfo status
will show how did CPU used.
Thank you very much.
Hi Asda
Yes NPU offloading is enabled by default.
This command set for NPU6 info & statistics should help:
https://docs.fortinet.com/document/fortigate/7.4.3/hardware-acceleration/591936/get-hardware-npu-np6
Thank you very much
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