Am 21.05.2021 um 14:50 schrieb Harry Schmalzbauer:
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)
Now that I have a living r332489 i386 available, I checked some sysctl.
It seems on ESXi and i386, large page mappings aren't used anymore, or
is it just wrong indicating?
These valueas are suspicious to my eyes:
kern.version: FreeBSD 12.0-CURRENT #0 r332489: Fri May 21 15:32:35 CEST 2021
root@esxtest:/usr/obj/altroot/usr/src/i386.i386/sys/GENERIC
hw.pagesizes: 4096 0
hw.realmem: 0
vm.min_kernel_address: 0
vm.max_kernel_address: 4286578688
vm.kvm_free: -549453824
vm.kvm_size: -16777216
vm.pmap.pg_ps_enabled: 0
kern.version: FreeBSD 12.0-CURRENT #1 r332488: Fri May 21 17:35:58 CEST 2021
root@esxtest:/usr/obj/altroot/usr/src/i386.i386/sys/GENERIC
hw.pagesizes: 4096 4194304
hw.realmem: 0
vm.min_kernel_address: 3220172800
vm.max_kernel_address: 4294963200
vm.kvm_free: 624947200
vm.kvm_size: 1073737728
vm.pmap.pg_ps_enabled: 1
Thanks for any hints,
-harry
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