Dave Voutila writes:
> Mike Larkin writes: > >> On Wed, Apr 07, 2021 at 12:22:23AM +0200, Thomas L. wrote: >>> On Tue, 6 Apr 2021 14:28:09 -0700 >>> Mike Larkin <mlar...@nested.page> wrote: >>> >>> > On Tue, Apr 06, 2021 at 09:15:10PM +0200, Thomas L. wrote: >>> > > On Tue, 6 Apr 2021 11:11:01 -0700 >>> > > Mike Larkin <mlar...@nested.page> wrote: >>> > > > Anything in the host's dmesg? >>> > > >>> > >>> > *host* dmesg. I think you misread what I was after... >>> >>> The dmesg of the host was already attached to the first mail below the >>> vm.conf (I mistakenly called the host hypervisor, which I realize now is >>> not accurate). I figured since it was already attached, that >>> you must mean the VM, compounding the confusion ... >>> >>> Kind regards, >>> >>> Thomas >>> >> >> I see. >> >> You'll probably need to build a kernel with VMM_DEBUG and save that output >> and >> send it to me once a VM crashes. Note: it will generate a lot of output and >> probably make things somewhat slower. >> >> -ml > > Thomas: I looked at your host dmesg and your provided vm.conf. It looks > like 11 vm's with the default 512M memory and one (minecraft) with > 8G. Your host seems to have only 16GB of memory, some of which is > probably unavailable as it's used by the integrated gpu. I'm wondering > if you are effectively oversusbcribing your memory here. > > I know we currently don't support swapping guest memory out, but not > sure what happens if we don't have the physical memory to fault a page > in and wire it. Looked a bit further and since your host is running 6.8 it doesn't have wiring memory logic, but I'd still be cautious about oversubscribing memory. > > Even without a custom kernel with VMM_DEBUG, if it's a uvm_fault issue > you should see a message in the kernel buffer. Something like: > > vmx_fault_page: uvm_fault returns N, GPA=0x...., rip=0x.... > You can also run vmd(8) with debug logging (-v or -vv) and maybe capture these events. Like with vmm(4) logging, it can be excessively verbose. > mlarkin: thoughts on my hypothesis? Am I wildly off course? > > -dv
