Re: Linux serial console patch

[James Courtier-Dutton]

Russell King wrote:
> On Mon, Sep 06, 2004 at 10:32:27AM +0000, Danny ter Haar wrote:
>
> > James Courtier-Dutton  <James@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > > > I have read your posts to lkml containing your serial console flow control
> > > > patches firstly for 2.4.x and then for 2.6.x kernels.
> > >
> > > Does this fix junk being output from the serial console?
> > > If one is using Pentium 4 HT, it seems that both CPU cores try to send 
> > > characters to the serial port at the same time, resulting in lost 
> > > characters as one CPU over writes the output from the other.
> >
> > We have multiple P4-HT enabled servers with debian installed & serial
> > console enabled (RPB++ ;-) and _i_ have never seen this behaviour.
>
>
> I don't think this is a serial problem as such, but a problem with the
> kernel console subsystem (printk) itself.  Maybe James can provide an
> example output to confirm exactly what he's seeing.

http://www.superbug.demon.co.uk/latency/

There are 2 oops traces there. At about line 176, the corruption starts.

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