extremely slow boot of RELENG_10

[Eugene Grosbein]

31.07.2019 22:30, mike tancsa wrote:

> While moving a pair of ZFS disks from an *very* old motherboard to a new
> one, I ran into an odd problem I had not seen before.  The box was
> running just fine RELENG_10 from FreeBSD 10.1-STABLE #18 r279918 on 10yr
> old MB. Boots normally and expected speeds for old hardware/CPU.  But on
> the new one, as soon as the |\-/|\ starts spinning, it looks like its
> 1/100th of the speed it should be.  Unfortunately, we didnt have the
> luxury to wait for it to boot up all the way.  We put the disks back in
> the old motherboard, did the RELENG_11 upgrade which included putting in
> the new boot blocks after zpool upgrade and then the disks booted just
> fine in the new box.  We at first thought it was a hardware issue, but
> same behaviour on another new MB, new SATA cables etc etc.
> 
> Any idea what was going on behind the scenes that might have caused it
> ?  Is there something about the way the old boot blocks would interact
> poorly with new motherboards (in this case, a SuperMicro X11SSH-F) ?

Maybe it attempted dual-console boot involving output to serial port...