Can anyone comment regarding CONFIG_HZ_100/CONFIG_HZ_300/CONFIG_HZ_1000 impact on VM performance? I think archlinux thread suggested CONFIG_HZ_1000, stock archlinux has CONFIG_HZ_100 and vfio kernel has CONFIG_HZ_300. Are these even important with rcu_nocbs/nohz_full kernel parameters?
On 2016.02.28 12:51, thibaut noah wrote: > I personnaly needed the acs patch and add to make myself a custom > kernel on fedora (hba card for zfs raid). > Arch is easier for this since one guy is maitaining a patched kernel, > you just have to download it. > On Sun, 28 Feb 2016 at 10:14, Okky Hendriansyah <[email protected] > <mailto:[email protected]>> wrote: > > On February 28, 2016 at 15:42:05, stein van broekhoven > ([email protected] <mailto:[email protected]>) wrote: > >> ... >> >> If anybody would attempt a build like this I would recommend >> Manjaro with plasma 5.5 (KDE) >> And follow this guide: >> https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF >> Only difference is: >> # mkinitcpio -p linux >> # mkinitcpio -p linux41 >> >> You do NOT need the kernel patch from: >> https://aur.archlinux.org/packages/linux-vfio/ >> >> >> >> Sent from my iPhone > > Hi Stein, > > Please correct me if I am wrong, but I think the question of > whether one needs the kernel patches that linux-vfio incorporates > or not, really depends on one's setup and hardware. > > The Intel HD arbitration patch is still needed if legacy VGA > assignment (with Seabios) is still being used on Intel platforms > with integrated Intel HD Graphics. > > The PCIe ACS override patch is still needed if the platform does > not support ACS and using other available PCIe slots for the host. > Although I've seen in this list that sometimes not all ACS cases > can be solved by this patch. > > For instance, my previous platform was Haswell i7-4770 with a GTX > 980, a USB 3.0 card, and a NIC card passed to Windows 10 guest > (OVMF) while having a RAID card in the last PCIe slot for my Arch > Linux host ZFS disk array. In my case, I did not need the Intel HD > arbitration patch since I use the legacy-free approach with OVMF. > But I still need the PCIe ACS override patch since the default > IOMMU grouping did not separate my RAID card with other PCIe devices. > > Other example on one of the members here, had similar platform as > mine. But he only has a GPU on his slots, thus he did not need the > PCIe ACS override patch. > > Best regards, > Okky Hendriansyah > > > _______________________________________________ > vfio-users mailing list > [email protected] <mailto:[email protected]> > https://www.redhat.com/mailman/listinfo/vfio-users > > > > _______________________________________________ > vfio-users mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/vfio-users
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