[Bug 2887] New: Readd CompressionLevel and use its value only for the sender

[bugzilla-daemon at bugzilla.mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=2887

            Bug ID: 2887
           Summary: Readd CompressionLevel and use its value only for the
                    sender
           Product: Portable OpenSSH
           Version: 7.7p1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: Miscellaneous
          Assignee: unassigned-bugs at mindrot.org
          Reporter: fabio.pedretti at unibs.it

Apparently CompressionLevel option was removed since there was no way
to tell other peer its value with SSH2.

However it would be useful to have it back and just use it for the
sender.

Indeed the decompression operation on the receiver is the same even
when changing the compression level (the receiver won't notice a change
of compression level on the sender).

Also the decompression is a lot faster than the compression and
independent of the compression level.

This way every peer should be able to set its compression level,
according to its wanted CPU usage. For example a client may choose a
higher compression level, while a server with many concurrent
connections may want to use a lower compression level.

Eventually CompressionLevel 0 should also be allowed, it should mean it
is able to receive compressed data, but only sends uncompressed data.

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