SFTP file upload very slow and stalls on Ubuntu -


i on wired network , trying upload iso files through lan.

the problem whenver try upload files, upload speed slow, in following screenshot:

enter image description here

under same exact conditions, using windows instead (even vm under same linux), upload fast, reaching 15 mb/sec, in following screenshot:

enter image description here

any appreciated.

update: following command fixes slow upload , stalling:

sudo sysctl -w net.ipv4.tcp_sack=0

to make permanent, edit /etc/sysctl.conf , add line

net.ipv4.tcp_sack = 0

then run:

sudo sysctl -p

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