Framebuffer overflow halts network (fwd)

Framebuffer overflow halts network (fwd)

[Geert Uytterhoeven]

---------- Forwarded message ----------
Date: Mon, 27 Jan 2003 21:44:13 +0100
From: Leif Neland <leif@neland.dk>
To: geert@linux-m68k.org
Subject: Framebuffer overflow halts network

Sorry to bother you "privately", but I can't find much info of the use of
framebuffer after it is installed.

I have set up my primary work machine (i.e. it is mostly used as a terminal
to connect to other servers) with framebuffer and have 64 lines*160 chars in
a pretty font.

I ssh to other servers from this machine.

If I do something which create a lot of output, eg. ls -lR /, the remote
machine sends more data than the framebuffer-terminal can handle. This
blocks the network on the terminal machine, which also is nameserver,
internal webserver and upsd server.

Is it possible to set up some sort of flow control, so the remote machine
stops when the terminal is overloaded?

Both servers are 100Mb, on different switches, which are connected at 100Mb
The terminal is on a Cisco, the other on a cheaper 24ports switch.

If you can't help me, can you direct me in the proper direction?

Leif



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Re: Framebuffer overflow halts network (fwd)

[James Simmons]

> Sorry to bother you "privately", but I can't find much info of the use of
> framebuffer after it is installed.
> 
> I have set up my primary work machine (i.e. it is mostly used as a terminal
> to connect to other servers) with framebuffer and have 64 lines*160 chars in
> a pretty font.
> 
> I ssh to other servers from this machine.
> 
> If I do something which create a lot of output, eg. ls -lR /, the remote
> machine sends more data than the framebuffer-terminal can handle. This
> blocks the network on the terminal machine, which also is nameserver,
> internal webserver and upsd server.
> 
> Is it possible to set up some sort of flow control, so the remote machine
> stops when the terminal is overloaded?
> 
> Both servers are 100Mb, on different switches, which are connected at 100Mb
> The terminal is on a Cisco, the other on a cheaper 24ports switch.
> 
> If you can't help me, can you direct me in the proper direction?

Which kernel are you using and whcih video card?



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Re: Framebuffer overflow halts network (fwd)

[Leif Neland]

----- Original Message -----
From: "James Simmons" <jsimmons@infradead.org>
To: "Geert Uytterhoeven" <geert@linux-m68k.org>
Cc: "Linux Frame Buffer Device Development"
<linux-fbdev-devel@lists.sourceforge.net>; "Leif Neland" <leif@neland.dk>
Sent: Wednesday, February 12, 2003 9:01 PM
Subject: Re: [Linux-fbdev-devel] Framebuffer overflow halts network (fwd)



> > I have set up my primary work machine (i.e. it is mostly used as a
terminal
> > to connect to other servers) with framebuffer and have 64 lines*160
chars in
> > a pretty font.
> >
> > I ssh to other servers from this machine.
> >
> > If I do something which create a lot of output, eg. ls -lR /, the remote
> > machine sends more data than the framebuffer-terminal can handle. This
> > blocks the network on the terminal machine, which also is nameserver,
> > internal webserver and upsd server.
> >

> Which kernel are you using and whcih video card?

Debian-version: 3.0

Linux 2.2.19

From dmesg:

Detected 350798 kHz processor.
vesafb: framebuffer at 0xdc000000, mapped to 0xd0000000, size 4096k
vesafb: mode is 1280x1024x8, linelength=1280, pages=2
vesafb: protected mode interface info at c000:5b6a
vesafb: scrolling: redraw
Console: switching to colour frame buffer device 160x64
fb0: VESA VGA frame buffer device

from /proc/pci

  Bus  0, device  12, function  0:
    VGA compatible controller: S3 Inc. ViRGE/DX or /GX (rev 1).
      Medium devsel.  IRQ 11.  Master Capable.  Latency=32.  Min Gnt=4.Max
Lat=255.
      Non-prefetchable 32 bit memory at 0xdc000000 [0xdc000000].

>



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Re: Framebuffer overflow halts network (fwd)

[Geert Uytterhoeven]

On Fri, 14 Feb 2003, Leif Neland wrote:
> From: "James Simmons" <jsimmons@infradead.org>
> > > I have set up my primary work machine (i.e. it is mostly used as a
> terminal
> > > to connect to other servers) with framebuffer and have 64 lines*160
> chars in
> > > a pretty font.
> > >
> > > I ssh to other servers from this machine.
> > >
> > > If I do something which create a lot of output, eg. ls -lR /, the remote
> > > machine sends more data than the framebuffer-terminal can handle. This
> > > blocks the network on the terminal machine, which also is nameserver,
> > > internal webserver and upsd server.
> 
> > Which kernel are you using and whcih video card?
> 
> Debian-version: 3.0
> 
> Linux 2.2.19

In 2.2.19, the console subsystem disables interrupts when outputting to the
console. This was fixed in 2.4.x.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds



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