[vfio-users] Hyperthreading and kvm

[Blank Field]

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>    So, I got it right that using OVMF my setup can work reliably? I was
considering to build it but it seems to be not so straight forward in
Gentoo.

I haven't tried doing this on gentoo, but you can try using "alien" to use
RPMs from kraxel.org
https://www.kraxel.org/repos/
Also, i recall there was just plain binary files builds from jenkins, lurk
around and see if you can make yourself an ebuild with an overlay.
Also, there's a xen-tools package which has OVMF USE-flag, try researching
this.
And i think i saw an user-created portage overlay with the OVMF package in
there.

I think plain libvirt and virt-manager should already be in the main
portage tree.

2015-08-19 6:16 GMT+03:00 José Ramón Muñoz Pekkarinen <koalinux at gmail.com>:

>      Hi,
>
>     So, I got it right that using OVMF my setup can work reliably? I was
> considering to build it but it seems to be not so straight forward in
> Gentoo.
>
>     BR.
>
>     José
> On Aug 19, 2015 3:09 AM, "Blank Field" <ihatethisfield at gmail.com> wrote:
>
>> Well, that sounds like the first time i've got it working.
>> Sooo, i've managed to make it work back then with just x-vga and qemu.
>> It worked. Sometimes.
>> Sometimes it crashed the host.
>> Sometimes it froze the VM and messed up the GPU.
>> I did a foolish research with no results whatsoever, but i've made one
>> observation - if the firefox is started and it eats a ton of memory, i have
>> better chances to run the VM right.
>> However, i've dropped that way and went the OVMF way, avoiding the VGA.
>> Check the dmesg, maybe you're more lucky than me with the motherboard and
>> it's just the GPU that freezes. Also, i'd check the temperatures.
>>
>> 2015-08-19 0:25 GMT+03:00 José Ramón Muñoz <koalinux at gmail.com>:
>>
>>>         Hi,
>>>
>>>         I'm using and APU a8-7650k, and apart that from time to time the
>>> win7
>>> guest decides to freeze, so many times during boot time, and ocassionally
>>> during gaming, I'm fairly happy with the performance. The passed through
>>> gpu
>>> is a HD5670 and I managed to play games like MGS Ground Zeroes, Blades of
>>> times, and currently DAO: Origins.
>>>
>>>         Best regards.
>>>
>>>         José.
>>>
>>> On Wednesday 19 August 2015 00:09:09 Blank Field wrote:
>>> > Use "Reply All" button. Include the mailing list in the "to:" field.
>>> >
>>> > >I'm currently running an A10-5700 with a discrete Nvidia card, and
>>> I've
>>> >
>>> > got a LMDE2 install in which I'm preparing to do an experimental W10
>>> VM.
>>> > So, according to your experience, I shouldn't expect much with this
>>> > processor, then?
>>> > http://pastebin.com/rEhebfQM
>>> > It will work. But it has taken a year for me to figure out how to make
>>> it
>>> > work.
>>> > The pastebin link is my currently working domain xml.
>>> > Two asus HD7750 on an asus F2A55+Athlon X4 750k (Trinity).
>>> > The kernel and module parameters are:
>>> > options kvm-amd npt=1 nested=0
>>> > options kvm ignore_msrs=0 allow_unsafe_assigned_interrupts=0
>>> > options vfio_iommu_type1 disable_hugepages=1 allow_unsafe_interrupts=0
>>> > CMDLINE:
>>> > nofb pci-stub.ids=1022:780d,1002:683f,1002:aab0 enable_mtrr_cleanup
>>> > amd_iommu_dump=1 iommu=pt acpi_enforce_resources=lax
>>> >
>>> > Try doing it with nested=1
>>> >
>>> > If you will use libvirt, that should work 100%, as i have almost the
>>> same
>>> > CPU.
>>> >
>>> > 2015-08-18 23:57 GMT+03:00 ALG Bass <olorin12 at gmail.com>:
>>> > > Gotcha. So it would be better if I got the i7.
>>> > > I'm currently running an A10-5700 with a discrete Nvidia card, and
>>> I've
>>> > > got a LMDE2 install in which I'm preparing to do an experimental W10
>>> VM.
>>> > > So, according to your experience, I shouldn't expect much with this
>>> > > processor, then?
>>> > >
>>> > > On Tue, Aug 18, 2015 at 3:46 PM, Blank Field <
>>> ihatethisfield at gmail.com>
>>> > >
>>> > > wrote:
>>> > >> Hyperthreading on host means MORE cores which you can commit to the
>>> VM.
>>> > >> More cores = more performance.
>>> > >> It is good for you.
>>> > >> For the host it doesn't matter logical or physical. For the VM,
>>> you'd
>>> > >> want to pin "pairs" of cores, so there would be less CPU cache
>>> issues.
>>> > >> Like, assign a core and it's sibling instead of two separate cores.
>>> > >>
>>> > >> I use AMD Athlon X4 750k which is based off A10-5700, and it's
>>> working
>>> > >> very unstable.
>>> > >> The only way to get it working - use OVMF without VGA and do not use
>>> > >> hugepages.
>>> > >> That's all.
>>> > >>
>>> > >> P.S.
>>> > >> Oh well, here we go again.
>>> > >>
>>> > >> 2015-08-18 22:26 GMT+03:00 ALG Bass <olorin12 at gmail.com>:
>>> > >>> Hi all, new to this list, kvm, and vfio. I've been researching
>>> this for
>>> > >>> about a week.
>>> > >>> I'm also going to be building a computer in the near future, so
>>> I've got
>>> > >>> a quick two part question:
>>> > >>> Does the hyperthreading on i7 series Intel processors make a
>>> significant
>>> > >>> difference in running Windows in a VM, such that it's a noticeable
>>> > >>> increase
>>> > >>> in performance over an i5? And, does anyone here run Windows in a
>>> VM
>>> > >>> using
>>> > >>> an AMD A-series APU like the 7700k, and how is the performance?
>>> > >>>
>>> > >>> Thank you!
>>> > >>>
>>> > >>> _______________________________________________
>>> > >>> vfio-users mailing list
>>> > >>> vfio-users at redhat.com
>>> > >>> https://www.redhat.com/mailman/listinfo/vfio-users
>>>
>>>
>>
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