How to boost network perfomance

[Basher52]

If some apllication uses all bandwidth available to it, how can I set some
other application to be boosted above that, so I atleast can get into the
server and do something.

Can I boost the priority of the process so do this?
Another LinuxGuru said I should use QoS, but isnt it possbile to just do what
I asked in the line above to do this?

[agent007]

You cannot boost the priority...What you can do is control the amount of bandwidth a system would use.. Go through some Squid docs. Its detailed there.

[Basher52]

Ive been check this and it seems that the app is not directly made for ftp and its exactly that that must be "lowered in priority", except when nothing else uses it.

What I need, is something that lets SSH be prioritized higher than all other network-using programs like http, https, ftp etc. thus letting me into the console and work with something else in the meantime.

Here's a "cut" from one squid manual.
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...Squid is a http proxy with ftp support, not a real ftp proxy. It can download from ftp, it can also upload to some ftp, but it can't delete/change name of files on remote ftp servers.

When we block ports 20 and 21, we won't be able to delete/change name of files on remote ftp servers...
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and this I can't allow