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Re: Flow-control weirdness

Christopher Fowler cfowler@outpostsentinel.com
Wed, 12 Mar 2003 12:39:22 -0800 (PST)

One thing to note here is that when using conserver with terminal
servers, you are not doing a close() and open() when you tell conserver
to reopen.  You are doing a close() and connect().  Depending on the
implementation of ethernet->serial in your terminals erver, it may not
drop DTR when you do this.  It may do nothing.

On Wed, 2003-03-12 at 14:56, Aaron Burt wrote:
> One of our programmers was diagnosing a problem with a RAID driver on
> Linux via serial console when he ran in to an interesting problem:
> The driver would dump a bunch of debug output, then stop in the middle.
> He'd bang return and about 16 characters of additional output would print.
> Each time he banged return, he'd get another li'l chunk of output.
> He called me over and I disabled hardware flow-control on the console's
> port on the terminal server (Computone RAS2000) and then did a ^Ecd/^Eco
> to cycle the port and apply the change.  The rest of the output spooled
> out, and I figured there was some sort of problem in the kernel's serial
> console code with hardware flow-control.
> To confirm the fix, I had him reproduce it again.  The problem recurred
> exactly the same way, even with no flow control.
> Put flow-control back, cycled the port again and the reset of the output
> flowed out.
> For now, I've told hom to cycle the port when this happens.
> I'm running Conserver 7.2.1 installed via handrolled RPM on a heavily
> doctored RH 7.1 system.
> Any clues, O Oracles of Serial Niftiness?
> Thanks in advance,
>   Aaron
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