On Mon, May 9, 2016 at 8:56 AM, Nicolas Roy-Renaud < nicolas.roy-renau...@ens.etsmtl.ca> wrote:
> Hello everyone. > > I've spent the last month or so reworking the pci passthrough article on > Arch Wiki <https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF>, > and I'm getting to the point where I'm starting to be pretty satisfied with > it personally. While there are still a few things I need to adress, > however, I'd like to get some feedback on the current article, as well as > possibly some topics that could be worth elaborating. Since I'm sure most > of those who are reading the mailing list have had trouble setting up their > passthrough at one point or another, I'm sure you all have some issue > you've managed to solve that you would like to share with others, so I'll > be collecting those and try to see if it makes sense to include them in > there. > > Here's a few of the common gotchas I'm already planning to add in the near > future : > > - Using identical GPUs on the guest and host machines (Garland Key had > that issue a while ago, and this requires some binding scripts) > - Passing through a device that cannot reset properly (I've had that > problem with my soundcard and still need to figure out a solution) > - Actually go into details about what the ACS override patch does and > how to configure it > - MSI interrupts for the GPU soundcards > > Also, I have a few questions for AW specifically, since he mentions a few > interesting in his blog that could't find all that much info on and could > use some clarification, namely : > > - What impact do hugepages have on host and guest performance? > - How exacly does host-passthrough affect performance? > - Is there an easy way to test if a device can reset properly without > a host reboot or not? I know a few pci devices have a /reset node to > indicate this, but recent issues with my integrated soundcard and the > reocurring complaints about AMD cards are making me consider adding a > section about that in the article. > > - Nicolas > Hi Nicolas, Appreciate your work on this. I would like to propose other things about VFIO/OVMF GPU passthrough that in my opinion should be included in the wiki as well: 1.) Avoid transparent hugepages and enable explicit hugepages (hugepages size variance 2 MB, 1 GB) 2.) Kernel configuration to improve performance like 1000 Hz clock resolution, Voluntary Preemptible Kernel, halt_poll_ns 3.) How to passthrough host primary GPU (if possible, :) ) 4.) CPU family that should be use if you want to avoid ACS patches [1] 5.) APIC-V vs Hyper-V VAPIC on recent Intel CPU 6.) Issues on upgrading Windows 10, which is similar to your core2duo workaround [2][3] 7.) In case someone interested in passing through GPU to a Mac OS X guest [4] [1] http://vfio.blogspot.com/2015/10/intel-processors-with-acs-support.html [2] https://www.redhat.com/archives/vfio-users/2015-November/msg00164.html [3] http://ubuntuforums.org/showthread.php?t=2289210 [4] http://www.insanelymac.com/forum/topic/309087-insanely-fast-virtual-mac-qemu-ovmf-clover-and-native-graphics/ Best regards, Okky Hendriansyah
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