[vfio-users] Hyperthreading and kvm

[Blank Field]

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>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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