T10: Support ftp async upload (was w/ Dolphin, not the same speed upload/download with sftp)

Originally reported by migration: https://bugs.libssh.org/T10

Hello, Sorry for my English, and I don't no if i can post this here...

When i download a file beetween 2 computers (Fedora16, KDE with Dolphin), the download speed (~10Mio/s) is faster than the upload speed (~2Mio/s).

I post here because i have this answer from KDE : https://bugs.kde.org/show//bug.cgi?id=287972 ~~------ Comment #1 From Andreas Schneider 2011-12-01 10:19:10 ------~~

Thanks for taking the time to report this bug.

kio//sftp is using libssh. libssh provides an async api for downloads but not for uploads. Please request async upload support upstream.

migration commented on 2017-06-19 06:44:24 UTC:

On Monday, July 15th 2013 21:01:42, Aris Adamantiadis

changed the subject from "lib_ssh with Dolphin, not the same speed upload/download with sftp" to "Support ftp async upload (was w/ Dolphin, not the same speed upload/download with sftp)"
unassigned Did G
set target version to "0.7.0"

migration commented on 2017-06-19 06:48:49 UTC:

On Monday, July 15th 2013 21:01:42, Aris Adamantiadis

changed the subject from "lib_ssh with Dolphin, not the same speed upload/download with sftp" to "Support ftp async upload (was w/ Dolphin, not the same speed upload/download with sftp)"
unassigned Did G
set target version to "0.7.0"

migration commented on 2017-06-19 06:50:33 UTC:

On Monday, July 15th 2013 21:01:42, Aris Adamantiadis

changed the subject from "lib_ssh with Dolphin, not the same speed upload/download with sftp" to "Support ftp async upload (was w/ Dolphin, not the same speed upload/download with sftp)"
unassigned Did G
set target version to "0.7.0"

migration commented on 2017-06-19 06:52:07 UTC:

On Monday, July 15th 2013 21:01:42, Aris Adamantiadis

changed the subject from "lib_ssh with Dolphin, not the same speed upload/download with sftp" to "Support ftp async upload (was w/ Dolphin, not the same speed upload/download with sftp)"
unassigned Did G
set target version to "0.7.0"

asn commented on 2018-09-04 18:48:03 UTC:

Enabling TCP_NODELAY should help a lot.

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