[vfio-users] VM slows down with +2gb RAM

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You can remove the host GPU making the host headless.
You remove the host GPU and the only way for you to actually see anything
is a serial console or SSH or VNC or whatever.
Just like on a real remote server.

2015-10-20 4:06 GMT+03:00 Manuel Zeusin <zeusin360 at gmail.com>:

> First, Thank you for take your time to respond my questions,
>
> José, you remember veeery good, qemu 2.3.1 + fedora 22 with 4.0.4 kernel
> can assign more ram than 2gb. I going to sleep this night with a happy
> face, thanks to you :D. i like to know in which fórum you read that, if
> it's posible.
>
> Alex, I going to try to use hugepages, because very often i have micro
> stuttering, for example in games... to describe the errors ocurred with 4.2
> kernel, the host itself it's idle with lxde and no applications open, just
> qemu loads with 100% cpu usage for cpus assignement to VM and the same
> for RAM, in this case, more tan 4gb free.
>
>
> For the first PD, is there any way to remove the host gpu? for me it's
> useless and if i can remove it i'm goint to sell this shitty gigabyte
> and buy a asrock... ( with asrock can't change the priority of vga pcie to
> boot, so i waste a pcie 3.0 x16 to radeon 2600hd, but iommu in xen/VMWare
> Works well and gigabyte can change the vga pcie boot priority, so i can use
> pcie 3.0 x16 to nvidia 970 and host gpu radeon hd2600 is in pcie 2.0
> x4, but its totally incompatible with xen/VMWare... just boot with one core
> -.-')
>
> Thank you so MUCH for you time.
>
> 2015-10-19 19:23 GMT+02:00 José Ramón Muñoz <koalinux at gmail.com>:
>
>>         Hi,
>>
>>         Which versions of qemu and kernel are you using? I remember to
>> have read
>> some similar cpu hangs out in recent kernels with recent qemu versions.
>> If I'm
>> right it should be enough to lower the kernel to 4.1.x.
>>
>>         Best regards.
>>
>>         José.
>>
>> On Monday 19 October 2015 13:01:53 Manuel Zeusin wrote:
>> > Hello,
>> >
>> > I try to make a multi-os gaming machine, one win 10 with NVIDIA 970 and
>> > other with win10 and AMD 7770... I can do it work and works like a
>> > charm...but with 2gb...
>> >
>> > My host is a 5820k with 4*4gb RAM, gigabyte X99-ud4 ( a shitty mobo ),
>> > radeon 2600hd for host, NVIDIA 970 and radeon 7770.
>> >
>> > For example, i do a fresh installation of windows for NVIDIA, with 2gb
>> RAM.
>> > The installation complete and GPU have vídeo, shutdown the computer and
>> > assign 4gb, Windows boot and everything slows down at almost freeze and
>> CPU
>> > goes to 80-100% with no reason, it doesnt matter if have 1vcpu or
>> 10vcpu.
>> > gpu sometimes have vídeo and sometimes not...  But.... If i remove VGA
>> PCI
>> > assignement, windows boot fine and works like a charm.
>> >
>> > I try fedora 22 and debian testing with the same result.
>> >
>> > PD: there is any possibilty to remove the radeon 2600 GPU host and do
>> the
>> > same with 2 GPU? I know with unraid distro its possible, but i cant do
>> it
>> > with debian.
>> >
>> > PD2: bad english, i know. Spanish here.
>>
>>
>
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