Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
Date: Mon, 07 Jun 2021 14:21:13 UTC
On Sat, Jun 05, 2021 at 01:00:45PM +0000, Wei Hu via freebsd-virtualization wrote: > Hi Harry, > > Can you test if this patch fixes the problems? > > https://reviews.freebsd.org/D30577 Hi Wei, Harry tested the patch before I submitted the review; it does indeed fix the problems with vmbus on i386/hyperv. > > -----Original Message----- > > From: Harry Schmalzbauer <freebsd@omnilan.de> > > Sent: Friday, May 21, 2021 8:50 PM > > To: Konstantin Belousov <kostikbel@gmail.com>; Wei Hu <weh@microsoft.com> > > Cc: freebsd-virtualization@freebsd.org > > Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root > > > > Am 19.05.2021 um 13:26 schrieb Harry Schmalzbauer: > > > > ... > > > I can just assure that I tracked it down to the single r332489 committ > > > which makes vmbus(4) failing on i386. > > > Verification done: > > > - built/installed world&kernel on i386 HyV guest with r332488 > > > reboot fine. > > > - built/installed kernel on the same vm after svnlite up -r 332489 > > > reboot fails with "vmbus0: cannot find free IDT vector" > > > - loaded kernel.old/kernel, did revert 332489, by 'svnlite up -r > > > 332488' and compiled/reinstalled kernel (again r332488) > > > reboot fine. > > > > While having hard time catching up with x86 basics, I found another oddity: > > On Hyper-V gen1, the maximum ammount of RAM I can assign a FreeBSD guest > > beeing able to boot i386 is 3914MB, startring with r332489. > > As soon as I configure the guest to have 3916MB or more, FreeBSD-i386 > > r332489 booting leads to guest reset. Loader starts kernel, machine reboots. > > Either reverting to r332488 or reducing guest-RAM solves this. > > > > The most interesting fact here is that I couldn't reproduce it on ESXi. > > I ducplicated the Hyper-V HDD and started the exactly same code on > > ESXi(v6) guest, where it doesn't crash! I can boot FreeBSD-i386 r332489 with > > any ammount of guest-RAM on ESXi. > > (speaking for GENERIC, non-PAE) > > > > Host CPU differs significantly though and I have no possibility to test this > > influence. Ther HyperV is Dual-Socket E5-2630 while the ESXi host is a single > > socket X3470 Xeon (pre SandyBridge). > > > > Maybe someone has an idea how this affects these symptoms. > > > > Thanks, > > -harry > > > > _______________________________________________ > freebsd-virtualization@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization > To unsubscribe, send any mail to "freebsd-virtualization-unsubscribe@freebsd.org"