WinSCP Upload transfer speed limit/cap. :: Support Forum

RandomInternetGuy
Joined:: 2015-01-01
Posts:: 8
Location:: Internet

WinSCP Upload transfer speed limit/cap.

2015-01-01 05:20

Problem: Same slow maximum limit/cap for any files.

WinSCP Version: 5.5.6 (Build 4746)

File sizes: ~4GB , ~300MB
File types: .7z , .mkv

Physical line: Gigabit Ethernet

iperf -s
iperf -c server.ip.address.here

[ ID] Interval Transfer Bandwidth
[ 4] 0.0-10.0 sec 850 MBytes 712 Mbits/sec

Microsoft Windows: Windows 7 Ultimate x64
Transfer protocol: SFTP-3
interface style: Commander Interface

Slow WinSCP Upload transfer speed: 4.780 KB/s

Precise steps: Drag and drop test files(see earlier info) from a fast SSD on the client desktop to server(typical HDD) by dragging from desktop to server location in GUI window.

Additional details:

.

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martin◆ Site Admin
Joined:: 2002-12-10
Posts:: 41,517
Location:: Prague, Czechia

Re: WinSCP Upload transfer speed limit/cap.

2015-01-05

Thanks for your report.
What are you results using other SFTP clients (FileZilla, PSFTP)?

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RandomInternetGuy
Joined:: 2015-01-01
Posts:: 8
Location:: Internet

Re: WinSCP Upload transfer speed limit/cap.

2015-01-05 19:15

martin wrote:

Thanks for your report.
What are you results using other SFTP clients (FileZilla, PSFTP)?

File Size: 1,457,835,581 Bytes.
Type: .mkv

Method: FileZilla(SFTP)
Upload speed: 8.5 MB/s
Download speed: 26.21 MB/s

Method: WinSCP(SFTP-3)
Upload speed: 4,958 KB/s
Download speed: 19 MB/s

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martin◆ Site Admin

Re: WinSCP Upload transfer speed limit/cap.

2015-01-06

Can you try 5.6.4 RC and execute it from a command-line like: winscp.exe sftp://user@host/ /rawsettings TcpNoDelay=1 /log=session.log?
Please attach the log here.

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RandomInternetGuy
Joined:: 2015-01-01
Posts:: 8
Location:: Internet

Re: WinSCP Upload transfer speed limit/cap.

2015-01-06 12:39

martin wrote:

Can you try 5.6.4 RC and execute it from a command-line like: winscp.exe sftp://user@host/ /rawsettings TcpNoDelay=1 /log=session.log?
Please attach the log here.

Upload speed: ~5,150 KB/s
Download Speed: ~19,300 KB/s

session.log (23.53 KB, Private file)

Description: Bet your life on it.

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RandomInternetGuy

2015-01-13 08:16

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martin◆ Site Admin
Joined:: 2002-12-10
Posts:: 41,517
Location:: Prague, Czechia

2015-01-29

RandomInternetGuy wrote:

<invalid link removed>

Sorry for delay. I have implemented yet another improvement:
https://winscp.net/tracker/1273
I have sent you an email with a development version of WinSCP to address you have used to register on this forum.

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RandomInternetGuy
Joined:: 2015-01-01
Posts:: 8
Location:: Internet

2015-01-30 04:19

martin wrote:

Sorry for delay. I have implemented yet another improvement:
https://winscp.net/tracker/1273
I have sent you an email with a development version of WinSCP to address you have used to register on this forum.

Same. Download speed got even worse... got down to 11.5 MB/s

session.log (18.42 KB, Private file)

Description: again, value with your life :/

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martin◆ Site Admin
Joined:: 2002-12-10
Posts:: 41,517
Location:: Prague, Czechia

2015-01-30

RandomInternetGuy wrote:

Same. Download speed got even worse... got down to 11.5 MB/s

Thanks for the test.
Can you please repeat the test with 5.6.4 RC to verify there are no external causes for the decrease?

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RandomInternetGuy
Joined:: 2015-01-01
Posts:: 8
Location:: Internet

2015-02-01 11:39

martin wrote:

RandomInternetGuy wrote:

Same. Download speed got even worse... got down to 11.5 MB/s
Thanks for the test.
Can you please repeat the test with 5.6.4 RC to verify there are no external causes for the decrease?

Ah, please, ignore the 11.5 MB/s download "downgrade", it happened because the connection to my server somehow got dumbed down to 100Mbs instead of the usual 1000Mbs.

After renegotiation to 1000Mbs, the download is back to around 19 MBs (Kind of also get the feeling the download is capped).

Regardless, the upload should have been more than 5MBs on either connection mode, so the problem with upload remains the same.

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martin◆ Site Admin

2015-02-11

I have sent you an email with some binaries for testing. Thanks!

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RandomInternetGuy
Joined:: 2015-01-01
Posts:: 8
Location:: Internet

Eat healthy food and do more exercise!

2015-02-12 01:03

martin wrote:

I have sent you an email with some binaries for testing. Thanks!

Replied with an email containing details of testing binaries.

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RandomInternetGuy
Joined:: 2015-01-01
Posts:: 8
Location:: Internet

2015-02-22 07:42

Hey Martin.

I have tried 5.7. Unfortunately it gives the same speed as 5.6.5 RC.

Perhaps you could include a x64 version so we could confirm those assumptions?

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