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LFTP/SFTP 1GB Download spikes and freezes

shimi269
in General Support

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I've got an issue that I just can't seem to find the root cause of. I have recently upgraded to 1GB fibre, and everything can download at the full advertised speed. Apart from LFTP, it can reach the full bandwidth (using FTP in that case, just to show the issue in the pictures), but LFTP will freeze randomly, the speed will drop, and then spike. I have attached pictures of 3 different runs so showcase this. 

 

I don't know how LFTP works, but I'm guessing that it downloads to RAM(?), and then get pushed to the SSD cache?? I'm thinking this because the SSD writes are correlating with the Network and CPU dips. But if this is the case, how I can I fix this issue to get my full bandwidth?

 

I have also attached the test script I am using for now, but I have tried many variations which still give me the same issue.

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