tty update speed regression (was: 2.6.14-rc2-mm1)

[Alexey Dobriyan]

I see regression in tty update speed with ADOM (ncurses based
roguelike) [1].

Messages at the top ("goblin hits you") are printed slowly. An eye can
notice letter after letter printing.

2.6.14-rc2 is OK.

I'll try to revert tty-layer-buffering-revamp*.patch pieces and see if
it'll change something.

[1] http://adom.de/adom/download/linux/adom-111-elf.tar.gz (binary only)

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