freebsd 9-stable TOP problem from around Jan 10

Jeremy Chadwick freebsd at
Wed Feb 15 09:58:57 UTC 2012

On Tue, Feb 14, 2012 at 11:08:49PM -0800, Julian Elischer wrote:
> On 2/14/12 4:20 PM, Jeremy Chadwick wrote:
> >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 at>   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:
> >
> >
> >
> >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.
> it seems to have stopped doing it for no apparent reason
> will keep an eye on it. and save this email away for when it does it
> again.
> >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.
> SC|screen|VT 100/ANSI X3.64 virtual terminal:\

Sorry, I'm quite wrong here on the last point.  Somehow my manual search
in vi did not come up with anything in /etc/termcap for screen, yet
there is absolutely a definition for it in RELENG_8.  PEBKAC.  :-)

| Jeremy Chadwick                              jdc at |
| Parodius Networking            |
| UNIX Systems Administrator                 Mountain View, CA, US |
| Making life hard for others since 1977.             PGP 4BD6C0CB |

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