Re: Minidumps in -STABLE and "smaller than physical memory"

On Wed, Jan 30, 2008 at 08:06:40PM +0300, Ruslan Ermilov wrote:
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@test2# sysctl debug.minidump
debug.minidump: 1
root@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@.


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@xxxxxxxxxxx
FreeBSD committer

No, this was and is i386. After changing "doadump;reset" to
doadump;continue" it would seem that the dumps has a higher chance
of making it to the disk.

--
Peter
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