On Wed, Apr 28, 2021 at 04:00:40PM -0500, Harry G. Coin wrote: > > On 4/28/21 3:15 AM, Dr. David Alan Gilbert wrote: > > * Harry G. Coin ([email protected]) wrote: > >> Kindly answer a couple 'basic' virtiofs questions: > >> > >> 1) Which mainline kernel version is necessary for the host, and for the > >> vm to enable reliable DAX operations -- supposing no shared host > >> activity on the underlying fs. > > I don't think there's any host kernel dependency for DAX > > currently. > > (You do need a guest with the DAX support) > > At least the version of the 'virt-manager' on fedora 33 doesn't support > the 'cache-size' host option, which as I understand from a post a few > days ago should be around 4G. That's why I asked about the host > requirements.
Generally there are no specifix host requirements. Guest kernel should have virtiofs DAX support. Also qemu needs dax support (option cache-size). That's not usptream yet. David has been posting patches for review. Hopefully it will be merged soon. W.r.t how big cache-size should be. I would say ideally it needs to be atleast as big as size of filesystem you are exporting into the guest. If filesystem is too small, I would think atleast 4G as minimum dax window size. Thanks Vivek _______________________________________________ Virtio-fs mailing list [email protected] https://listman.redhat.com/mailman/listinfo/virtio-fs
