Re: Using netconsole for debugging suspend/resume

[Matt Mackall <mpm@selenic.com>]

On Fri, Jun 09, 2006 at 07:50:25AM +0200, Andi Kleen wrote:
> On Friday 09 June 2006 07:23, David Miller wrote:
> > From: Auke Kok <auke-jan.h.kok@intel.com>
> > Date: Thu, 08 Jun 2006 22:13:48 -0700
> > 
> > > netconsole should retry. There is no timeout programmed here since that might
> > > lose important information, and you rather want netconsole to survive an odd
> > > unplugged cable then to lose vital debugging information when the system is
> > > busy for instance. (losing link will cause the interface to be down and thus
> > > the queue to be stopped)
> > 
> > I completely disagree that netpoll should loop when the ethernet
> > cable is plugged out. 
> 
> Currently it is a bit dumb and doesn't distingush the various cases
> well.
> 
> I submitted a patch to loop to be a bit more clever at some point. It can be still
> found in the netdev archives.

Agreed that timeouts should happen.

IIRC, the trouble with your patch was that it a) timed out on far too
short a timescale and b) locked up on my box. Unfortunately, so did my
own patch, which made timeouts approximately 1ms.

-- 
Mathematics is the supreme nostalgia of our time.