Re: Enabling NUMA in BIOS stop booting FreeBSD

On Wed, Dec 14, 2016 at 04:40:33PM +0200, Konstantin Belousov wrote:

> On Wed, Dec 14, 2016 at 03:13:36PM +0300, Slawa Olhovchenkov wrote:
> > On Wed, Dec 14, 2016 at 01:39:27PM +0200, Konstantin Belousov wrote:
> > 
> > > In other words, it is almost certainly the hang and not a fault causing
> > > hang. This means that the machine is not compliant with the IA32
> > > architecture, in particular, the region reported as normal memory by
> > > E820 BIOS service does not behave as normal memory.
> > > 
> > > Since regardless of the option setting, the memory map is same, and
> > > bootstrap page table only depend on the memory map, we use the same page
> > > table when hanging and when operating correctly. We do not fault or hang
> > > when the option is turned off, which together with the improved early
> > > fault handling in the patch, makes it almost certain that the problem is
> > > in hardware configuration and not in our early setup.
> > > 
> > > Of course, the most puzzling part is that memory test makes the hang
> > > go away, while repeating memory test operation only on the msgbuf region
> > > does not. msgbuf is special in that it is located at TOHM (top of high
> > > memory). It spans 128KB from below it to the last byte of the last
> > > physical segment.
> > > 
> > > The only ideas I have right now is that there is either a bug in the
> > > Caching Agent/Home agent/IMC configuration in BIOS, in which case there
> > > is nothing OS can do to mitigate it.  Or it might be that the memory
> > > map reported by CMS is wrong (you said that you use legacy boot, right
> > > ?).  This is not too surprising if true, because non-EFI boot code path
> > > definitely get less and less testing.
> > > 
> > > For the later case (potential bug in CMS), could you switch to EFI boot
> > > mode and see whether the issue magically healths itself ?  You could boot
> > > from USB stick in EFI mode without reinstalling for test.
> > 
> > I can't boot from USB stick -- this is remote DC and IPMI allow only
> > CDROM emulation.
> > 
> > OK, I am boot in UEFI 12.0 snapshot ISO.
> > Boot ok.
> > 
> > Can I convert installed OS to UEFI mode?
> I am not sure what do you ask there.  Are you asking whether I need any
> further information from the broken setup ?  I believe that no, I cannot
> debug this any further.

I am don't touch UEFI before. I am try to know how to switch for
existing installtion from legacy boot to UEFI boot (for use less
broken setup).

[may be NUMA+interleaving don't give me any good, but I am need test
for sure]

> I think that the interesting piece of data that can be obtained now is
> the memmap command output from the EFI loader from all three configurations,
> NUMA on/off and interleaving.

What you mean 'EFI loader'?
FreeBSD loader for UEFI mode?
Or UEFI shell from BIOS?

> > 
> > > Do you use latest BIOS for your motherboard ?
> > 
> > This is new MB (X10DRi) w/ BIOS 2.0, new is 2.1 but update is not
> > simple (need to prepare bootable dos ISO, mostly utilites don't work
> > under FreeBSD).
> IMO the only way to fix this issue, if it is really important, is
> to contact supermicro and show them the bug.  But this only makes sense if
> repeated on the latest firmware version.