Slow download on network drives

Need help with FileZilla Client? Something does not work as expected? In this forum you may find an answer.

Moderator: Project members

Post Reply
Message
Author
Zazou
500 Command not understood
Posts: 5
Joined: 2019-12-27 22:49

Slow download on network drives

#1 Post by Zazou » 2020-06-16 20:53

Hello,

I have some problems download speed with FileZilla.
  • My connection is 500 dl /400 up.
  • Windows 10 Pro on both computers
  • Gigabit switch
  • 2 computers on the network
  • FileZilla 3.48 on both computers
No problem when I download a file on my computer from a SFTP connection, I'm at around 60 Mb/s. When I download a file to a connected drive on my network it never exceeds 2-2,5 mb/s.

-If a transfer a file from my PC to the other computer by Windows explorer I'm at 80 Mb/s. So no problem.
-I installed fileZilla on the other computer and tested a download, no problem, I'm at 60 Mb/s.

To summarize :

SFTP > My computer : 60 Mb/s
SFTP > Network Drive through my PC : 2 Mb/s
SFTP > Second computer : 60 Mb/s
Windows explorer from my PC > Network Drive on the second PC > 80 Mb/s

Do you know with transfers are so slow from my PC to a network drive ?

Thank you :)

User avatar
boco
Contributor
Posts: 25196
Joined: 2006-05-01 03:28
Location: Germany

Re: Slow download on network drives

#2 Post by boco » 2020-06-18 01:04

Please note that when transferring between an (S)FTP server and a network drive, all data has to be transferred two times (once between the (S)FTP server and local memory/buffer, and once between local memory/buffer and the SMB share). Can get very slow, as SMB isn't the fastest protocol. Especially network adaptors without the full duplex setting applied cannot transfer in both directions at the same time.

While you have a Gigabit switch, what speed and duplex setting was actually negotiated for each PC?
### BEGIN SIGNATURE BLOCK ###
No support requests per PM! You will NOT get any reply!!!
FTP connection problems? Do yourself a favor and read Network Configuration.
FileZilla connection test: https://filezilla-project.org/conntest.php
### END SIGNATURE BLOCK ###

Zazou
500 Command not understood
Posts: 5
Joined: 2019-12-27 22:49

Re: Slow download on network drives

#3 Post by Zazou » 2020-06-20 20:56

Hello boco,

Thank you for your answer.

My first PC is in Wifi (802.11ax)
My second PC (the "server") is in "Auto-negociated"

I'll switch to 1.0 Gbps Duplex.

P.S : I have 2 recent PC with SSD (Ryzen 2700x/3700x, 16 GB of Ram, etc).

EDIT: nothing change :(

Image

I tested the speed of my network to be sure there was no problem.
Image

User avatar
botg
Site Admin
Posts: 33062
Joined: 2004-02-23 20:49
First name: Tim
Last name: Kosse
Contact:

Re: Slow download on network drives

#4 Post by botg » 2020-06-22 07:13

While a slow transfer is ongoing, what latency do you get if you ping the other machine?

Zazou
500 Command not understood
Posts: 5
Joined: 2019-12-27 22:49

Re: Slow download on network drives

#5 Post by Zazou » 2020-06-22 20:21

Hello hotg, thank you for you reply :

Without a transfer:
Image

While a transfer:
Image

Seems there are no incidence with the ping.

User avatar
botg
Site Admin
Posts: 33062
Joined: 2004-02-23 20:49
First name: Tim
Last name: Kosse
Contact:

Re: Slow download on network drives

#6 Post by botg » 2020-06-23 08:13

My best guess would be lack of a write cache for the network share. With SFTP, the write sizes can be small. Without caching for each of the writes, the software has to wait for the system to send the data over the network to the share and wait for the server to acknowledge it.

Post Reply