Minidumps in -STABLE and "smaller than physical memory"

[Ruslan Ermilov]

On Thu, Sep 21, 2006 at 05:16:36PM +0200, Peter Holm wrote:
> On Thu, Sep 21, 2006 at 05:15:47PM +0400, Ruslan Ermilov wrote:
> > On Thu, Sep 21, 2006 at 11:14:33AM +0100, Gavin Atkinson wrote:
> > > On Thu, 2006-09-21 at 11:44 +0300, Dmitry Pryanishnikov wrote:
> > > > Hello!
> > > > 
> > > >    I've noticed (with the 2-day old RELENG_6) that I still can't configure my
> > > > 256Mb swap partition as a dump device for i386 machine with 1Gb RAM despite
> > > > having minidumps enabled:
> > > > 
> > > > root at test2# sysctl debug.minidump
> > > > debug.minidump: 1
> > > > root at test2# dumpon -v /dev/ad0s3b
> > > > /dev/ad0s3b is smaller than physical memory
> > > > 
> > > > Am I correctly understand that minidumps should lift the restriction
> > > > 
> > > >  	sizeof(dumpdev) >= sizeof(RAM)
> > > 
> > > Yes.
> > > 
> > > http://www.freebsd.org/cgi/cvsweb.cgi/src/sbin/dumpon/dumpon.c.diff?r1=1.22&r2=1.23
> > > needs to be MFC'd.
> > > 
> > I sent an MFC request to re at .
> > 
> 
> >From time to time I've had problems with minidumps on HEAD. Calling
> doadump() seems to work ok, but after a reset there's no dump. I
> haven't had time to test this systematically. Has anybody else seen
> this problem?
> 
I think this was the same problem as was diagnosed (minidumps + amd64 +
SMP).  Though it's not fixed yet, it's understood and its damage is
avoided.


Cheers,
-- 
Ruslan Ermilov
ru at FreeBSD.org
FreeBSD committer