$ timeout 5 ssh git@github.com git-upload-pack
Terminated

$ timeout 5 ssh -o IPQoS=af21 git@github.com git-upload-pack
0054ERR
  is not a valid repository name
Visit https://support.github.com/ for help

$ timeout 5 ssh -o IPQoS=cs1 git@github.com git-upload-pack
0054ERR
  is not a valid repository name
Visit https://support.github.com/ for help

$ timeout 5 ssh -vvv git@github.com git-upload-pack 2>&1 |grep IP_TOS
debug3: set_sock_tos: set socket 3 IP_TOS 0x48
debug3: set_sock_tos: set socket 3 IP_TOS 0x20
Terminated

$ timeout 5 ssh -vvv -o IPQoS=af21 git@github.com git-upload-pack id 2>&1 |grep IP_TOS
debug3: set_sock_tos: set socket 3 IP_TOS 0x48
debug3: set_sock_tos: set socket 3 IP_TOS 0x48

$ timeout 5 ssh -vvv -o IPQoS=cs1 git@github.com git-upload-pack id 2>&1 |grep IP_TOS
debug3: set_sock_tos: set socket 3 IP_TOS 0x20
debug3: set_sock_tos: set socket 3 IP_TOS 0x20