Date: Thu, 22 Sep 2005 17:08:15 -0700
From: Nishanth Aravamudan <nacc@us.ibm.com>
To: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org
Subject: Re: tty update speed regression (was: 2.6.14-rc2-mm1)
Message-ID: <20050923000815.GB2973@us.ibm.com>
References: <20050921222839.76c53ba1.akpm@osdl.org> <20050922195029.GA6426@mipter.zuzino.mipt.ru> <20050922214926.GA6524@mipter.zuzino.mipt.ru>
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On 23.09.2005 [01:49:26 +0400], Alexey Dobriyan wrote:
> On Thu, Sep 22, 2005 at 11:50:29PM +0400, Alexey Dobriyan wrote:
> > 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)
> 
> Scratch TTY revamp, the sucker is
> fix-sys_poll-large-timeout-handling.patch
> 
> HZ=250 here.

Alexey,

Thanks for the report. I will take a look on my Thinkpad with HZ=250
under -mm2. I have some ideas for debugging it if I see the same
problem.

Thanks,
Nish
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