[vfio-users] Significant FPS drop with AMD and GTX970

[Rokas Kupstys]

You know.. What i am going to tell you will not sound good. My board was
Sabertooth 990-fx R2. My little story is that at first it seemed to run
ok (with r9 270X card). I sinked enough hours to titanfall and it was
great. After good period of time of non-usage (as board was in warranty
service and eventually swapped to brand new board), multiple kernel
updates and migration to archlinux i no longer could get it running as
fast. Now i do not know if i just did not feel slowness initially and it
was always there or if something changed, but i know for a fact that
testing older kernel releases did yield a little bit better performance
(enough that i could notice). So i moved back to dual-booting due to
performance reasons. In the end combination of this and r9 270X
constantly causing entire PC to go down with a red screen i simply
swapped hardware for intel x99 + nvidia gpu. Such is sad story of mine..

Rokas Kupstys

On 2016.10.10 11:48, Andrei Grigore wrote:
>
> Could it be an issue caused by the MB chipset (990-fx)? How can you
> debug something like this?
>
>
> On Oct 8, 2016 15:46, "Andrei Grigore" <andrei.grg at gmail.com
> <mailto:andrei.grg at gmail.com>> wrote:
>
>     Pretty sure, yes. Under: /etc/modprobe.d , then rebuilt the
>     initramfs with mkinitcpio -p linux and rebooted.
>
>
>     On Oct 8, 2016 15:44, "Rokas Kupstys" <rokups at zoho.com
>     <mailto:rokups at zoho.com>> wrote:
>
>         Sure you put config in the right place? Because depending on
>         how kernel modules are compiled config go to different places.
>
>
>
>         Sent from my Samsung device
>
>
>         -------- Original message --------
>         From: Andrei Grigore <andrei.grg at gmail.com
>         <mailto:andrei.grg at gmail.com>>
>         Date: 10/8/16 16:14 (GMT+02:00)
>         To: Rokas Kupstys <rokups at zoho.com <mailto:rokups at zoho.com>>
>         Cc: vfio-users <vfio-users at redhat.com
>         <mailto:vfio-users at redhat.com>>, Jayme Howard
>         <g.prime at gmail.com <mailto:g.prime at gmail.com>>
>         Subject: Re: [vfio-users] Significant FPS drop with AMD and
>         GTX970
>
>         Just tried. No improvement.
>
>
>         On Oct 8, 2016 14:43, "Rokas Kupstys" <rokups at zoho.com
>         <mailto:rokups at zoho.com>> wrote:
>
>             See https://bbs.archlinux.org/viewtopic.php?id=162768
>             <https://bbs.archlinux.org/viewtopic.php?id=162768> first
>             post. See if you need ignore_msrs
>             or allow_unsafe_interrupts. I had similar issue with and
>             board and some module options fixed it I think.
>
>
>             Sent from my Samsung device
>
>
>             -------- Original message --------
>             From: Andrei Grigore <andrei.grg at gmail.com
>             <mailto:andrei.grg at gmail.com>>
>             Date: 10/8/16 10:49 (GMT+02:00)
>             To: Jayme Howard <g.prime at gmail.com
>             <mailto:g.prime at gmail.com>>
>             Cc: vfio-users <vfio-users at redhat.com
>             <mailto:vfio-users at redhat.com>>
>             Subject: Re: [vfio-users] Significant FPS drop with AMD
>             and GTX970
>
>             Unfortunately, that didn't help. Thanks for the sugestion
>             though!
>
>
>             On Oct 8, 2016 03:06, "Jayme Howard" <g.prime at gmail.com
>             <mailto:g.prime at gmail.com>> wrote:
>
>                 Check to see if you have MSI enabled.  That'd be my
>                 bet.  Alex had a blog post that covered it, but I
>                 don't have the link handy.
>
>                 On Fri, Oct 7, 2016 at 6:39 PM, Andrei Grigore
>                 <andrei.grg at gmail.com <mailto:andrei.grg at gmail.com>>
>                 wrote:
>
>                     Hi all,
>
>                     I was wondering if anyone is experiencing this and
>                     if there is a known fix for it.
>
>                     I am using ArchLinux with latest stable Kernel,
>                     qemu and libvirt.
>
>                     My CPU is FX-8230 with a GTX 970. I've passed
>                     thorugh the GPU to a Win10 guest.
>
>                     In WoW on bare metal i get 90 fps and in the same
>                     area with the same graphic settings on the VM i
>                     get around 50. There seems to be no cpu and or ram
>                     bottlenet and the GPU seems to be quite gully used
>                     since the fans are starting to spin quite soon.
>
>                     Can anyone help here with a suggestion? I saw
>                     reports with about 3% performance drop, but I am
>                     experiencing a lot more.
>
>                     Thanks!
>                     Andrei.
>
>
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>
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