Date: Tue, 14 Feb 2012 16:20:37 -0800 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Julian Elischer <julian@freebsd.org> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: freebsd 9-stable TOP problem from around Jan 10 Message-ID: <20120215002036.GA9938@icarus.home.lan> In-Reply-To: <4F3AEFA5.1020906@freebsd.org> References: <4F3A1A19.7010803@freebsd.org> <CAN6yY1umQGASmFBN_=-X_OBtLsCTzrVYH4u6H--4-U-0f_tZyw@mail.gmail.com> <4F3AEFA5.1020906@freebsd.org>
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On Tue, Feb 14, 2012 at 03:35:01PM -0800, Julian Elischer wrote:
> On 2/14/12 10:38 AM, Kevin Oberman wrote:
> >On Tue, Feb 14, 2012 at 12:23 AM, Julian Elischer<julian@freebsd.org> wrote:
> >>Has anyone else seen a problem with top -H -S?
> >>
> >>after a short while the screen gets more and more corrupted..
> >>
> >>hitting ^L or turning off S& H modes helps .. for a while.
> >>
> >>If this is a known fixed problem, let me know but I need to co-ordinate with
> >>others
> >>to upgrade the machine in question.
> >Not seeing it here on 9-stable. Could it be a display issue? I am
> >using gnome-terminal with TERM defined as 'xterm'.
>
> yeah I'm on a mac with iterm, but running through 'screen' .
>
> it's never been a problem before.. just since we upgraded to 9-stable.
If you remove GNU screen from the picture does the problem go away? If
so, I'm not surprised. :-)
Make sure that when you're using GNU screen, that all shells launched
"under/within" screen have TERM=screen. If they don't, then this is
almost certainly the problem -- GNU screen "translates" between terminal
types, meaning it translates its own terminal type ("screen") into
whatever TERM is currently attached ("xterm", "iterm", whatever). See
the last 4 paragraphs of my post here to understand what exactly GNU
screen is doing:
http://lists.freebsd.org/pipermail/freebsd-stable/2011-June/063052.html
So, in general, make sure your dotfiles and so on don't mess about with
the $TERM environment variable and you should generally be okay.
If within GNU screen TERM=screen and you see the problem, but outside of
screen you use TERM=xterm (or something else) but don't see the problem,
then I would almost certainly blame GNU screen. If you're looking for
something that simply keeps a terminal running in the background, try
nohup or tmux.
Alternately, possibly someone added a "screen" entry to /etc/termcap on
RELENG_9? I don't use 9 so I have no way to confirm this, but on 8
there is no such entry.
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, US |
| Making life hard for others since 1977. PGP 4BD6C0CB |
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