Bug 278182

Summary:	KIO SFTP upload speed = 1MBPS over 1Gbps link, thunar MUCH faster.
Product:	[Unmaintained] kio	Reporter:	Antonio Orefice <kokoko3k>
Component:	sftp	Assignee:	Andreas Schneider <asn>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	kokoko3k
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Antonio Orefice 2011-07-21 07:33:42 UTC

Version:           unspecified (using Devel) 
OS:                Linux

As the subject says, if i open dolphin and try to upload a file to a remote server over my lan (1gbps link) the speed is about 1.2MBps, sometimes it goes to 12MBps.
But the same file copied via sshfs (with dolphin) is faster, about 33MBps
Thunar reaches the speed of about 50MBps.

Reproducible: Didn't try

Steps to Reproduce:
upload a file via kio sftp over a gigabit link and observe how slow it is.
do the same with thunar and see that is much much faster

Actual Results:  
1,2MBps or sometimes 12MBps

Expected Results:  
at least 50MBps (thunar reaches that)

Comment 1 Andreas Schneider 2011-07-21 11:06:23 UTC

Thanks for reporting this bug. Please open a bug upstream at http://red.libssh.org/ and request async write support for sftp. Thanks!

Comment 2 Antonio Orefice 2011-07-21 11:13:02 UTC

Previous kde releases (4.6.3) uploaded the same file at about 30MBps.
Do you still think that the issue is entirely with libssh or maybe something else changed and make the thing even worse?

Comment 3 Antonio Orefice 2011-07-21 11:16:58 UTC

Just made another try...
Download speed has dropped to ridicolous speed too 1.7MBps.

I forgot to say, 4.6.5 release

Comment 4 Andreas Schneider 2011-07-21 11:19:19 UTC

The code uploading and downloading a file in KDE 4.6 hasn't changed since more than a year.

Comment 5 Andreas Schneider 2011-07-21 11:25:23 UTC

The only change between 4.6.3 and 4.6.5 is a bugfix to the rename function.

http://quickgit.kde.org/?p=kde-runtime.git&a=history&h=24053d80ac862a2b41088476bb087be5e454b338&f=kioslave/sftp/kio_sftp.cpp

Comment 6 Antonio Orefice 2011-07-21 11:36:29 UTC

You are 100% right, i apologize.
I checked the last upgrade of libssh in my installation and downgraded it from
0.5.0 to 0.4.8 and i've the speed i had before.

Comment 7 Andreas Schneider 2011-07-21 12:29:30 UTC

Please report a bug at http://red.libssh.org/

Comment 8 Antonio Orefice 2011-07-22 12:14:08 UTC

https://bugs.kde.org/show_bug.cgi?id=278182

Comment 9 Antonio Orefice 2011-07-22 12:15:32 UTC

Sorry, wrong link:
https://red.libssh.org/issues/55