On Mon, 11 Feb 2019 22:06:36 +0100 Tobias Geiger <tobias.gei...@vido.info> wrote:
> > On Thu, Jan 17, 2019 at 11:03:03PM +0100, Tobias Geiger wrote: > >> Hello! > >> > >> after nearly 5 years of passing through my Radeon HD7800 - it feels old and > >> slow when used with newer games and 1GB of RAM also doesn't feel right > >> anymore... > >> > >> I tried a VEGA 64 - i was able to live with the ACS patch needed here (Z170 > >> Chipset... not needed with the old HD7800, but whatever...) - but i > >> couldn't > >> stand the reset/FLR/Bug which forces you at least to suspend/resume the > >> host > >> when you want to reboot only the guest... > >> > >> So my question is - AMD or NVIDIA, i dont care, cheap or superexpensive > >> (ok, > >> not the quadros) - what do you recommend these days for a hassle-free > >> passthrough experienence (well at least mostly - acs patch needed would be > >> ok, reset bug not so... it just makes it unhandy to use in day-to-day > >> scenarios...) > > Wouldn't needing the ACS patch depend on your mobo as opposed to your GPU? > > > I thought so, too! But then this: For my old HD7850 i do NOT need ACS > patch, to get it working flawlessly in my Z170 Board - it works with a > debian standard kernel even; > > The Vega 64 - in the same slot, same board - needs the ACS patch... > > dont ask me why... i can only guess it might have to do with the pci > bridges "within" the Vega64... but thats not more than a very uneducated > guess.... Generally the ACS patch should only depend on the motherboard unless you're trying to split the individual functions of a card to separate VMs. It shouldn't make much difference whether those functions are separate devices downstream of an on-card switch or functions within a multi-function device when assigned to a single VM. The motherboard ACS override would control things like whether separate physical slots are grouped together. We can only speculate without more data though. Thanks, Alex _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
