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Slow scp transfers to /tmp [Version: 6.9.0-beta25]

  • Minor

I'm running Version: 6.9.0-beta25 while I wait for the final release.

 

Server is a Dell T340 with 64GB of RAM.

 

On a wired Gigabit connection when transferring data to /tmp I'm seeing an initial burst of data (99MB/s), and then it falls to under 10MB/s after 6 seconds and keeps declining.

 

Transferring the same file to an nvme mounted drive is SOMETIMES FAST, it maintains the 100MB+ speed for the entire transfer.  Other times it will have varying rates of transfer.

 

Transferring the same file to a Centos 7 VM running on the unraid server is ALWAYS FAST.

 

It seems that /tmp is ALWAYS SLOW.

Steps to replicate:

#create 600MB file
>dd if=/dev/urandom bs=1024 count=600000 of=/tmp/random.data
>scp /tmp/random.data root@unraid-server:/tmp

 

/tmp info:

root@Rocinante:/tmp# df -h /tmp
Filesystem      Size  Used Avail Use% Mounted on
rootfs           32G  1.4G   30G   5% /

Wireshark IO graph attached.

Screen Shot 2021-01-20 at 12.02.30 PM.png

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