LFTP/SFTP 1GB Download spikes and freezes


Recommended Posts

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.

Capture.PNG

Capture2.PNG

Capture3.PNG

Capture4.PNG

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.