UEFI & ZFS

[Yamagi Burmeister]

Hello,
I've observed the slowness only on the local console, I haven't tested
the seriel console. Put the FreeBSD legcay installation usb stick into
the box, select it as boot device and watch the cursor spinning for
about 10 minutens until the kernel boots. Do the same with an UEFI
installation stick and it's a matter of seconds... 

I've seen this on an Gigabyte GA-Z170XP-SLI with a Core i7 6700k and on
two Supermicro X11SBA-LN4F based machines with Skylake Xeon CPUs. There
are several other reports of slow boot on Skylake CPUs on the net. In
the thread mentioned below some changes in the hardware, the firmware 
or somewhere else were suspected. I didn't even try to debug it,instead
I went with the UEFI loader.

Regards,
Yamagi

On Sun, 14 Feb 2016 13:47:05 +0200
Daniel Braniss <danny at cs.huji.ac.il> wrote:

> > On 14 Feb 2016, at 11:52, Yamagi Burmeister <lists at yamagi.org> wrote:
> > 
> > https://lists.freebsd.org/pipermail/freebsd-current/2015-December/059037.html

> when saying ‘slow’, do you see slowness when printing output to the screen?
> I mention this, because in the past I saw something similar, and it was a
> misconfiguration with the serial console …
> 
> danny
> 
> > 
> > Regard,
> > 
> > 
> > On Fri, 12 Feb 2016 15:36:10 -0500
> > "Thomas Laus" <lausts at acm.org> wrote:
> > 
> >>> I have a new Asus H170-Plus-D3 motherboard that will be used for a DOM0 Xen
> >>> Server.  It uses an Intel i5-6300 processor and a Samsung 840 EVO SSD.  I
> >>> would like to use ZFS on this new installation.  The Xen Kernel does not
> >>> have UEFI support at this time, so I installed FreeBSD CURRENT r295345 in
> >>> 'legacy mode'.  It takes about 7 minutes to go from the first '|' character
> >>> to getting the 'beastie' menu.  I changed the BIOS to UEFI and did another
> >>> installation.  The boot process goes in an instant.
> >> 
> >> Several others have the same problem. See here on the freebsd forums:
> >> 
> >> http://tinyurl.com/z9oldkc
> >> 
> >> That is my exact problem.  It takes 4 minutes to get a complete 'beastie' 
> >> menu and 7 minutes 34 seconds to login.
> >> 
> >> Tom
> >> 
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> > 
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