On Mon, Sep 11, 2023 at 3:06 PM Dragos Tatulea <dtatulea@xxxxxxxxxx> wrote: > > Hi Jason, > > On Mon, 2023-09-11 at 14:43 +0800, Jason Wang wrote: > > On Sat, Sep 9, 2023 at 4:45 PM Si-Wei Liu <si-wei.liu@xxxxxxxxxx> wrote: > > > > > > Following patchset introduces dedicated group for descriptor table to > > > reduce live migration downtime when passthrough VQ is being switched > > > to shadow VQ. This RFC v2 is sent to incorporate the early feedback > > > from reviewers on the uAPI and driver API part of changes, the > > > associated driver patch set consuming ths API will come around > > > soon along with formal submission of this series. > > > > > > Some initial performance data will be gathered using the real > > > hardware device with mlx5_vdpa. The target goal of this series is to > > > reduce the SVQ switching overhead to less than 300ms on a ~100GB > > > guest with 2 non-mq vhost-vdpa devices. The reduction in the downtime > > > is thanks to avoiding the full remap in the switching. > > > > > > The plan of the intended driver implementation is to use a dedicated > > > group (specifically, 2 in below table) to host the descriptor tables > > > for data vqs, different from where buffer addresses are contained (in > > > group 0 as below). cvq does not have to allocate dedicated group for > > > descriptor table, so its buffers and descriptor table would always > > > belong to the same group (1 in table below). > > > > > > > > > | data vq | ctrl vq > > > ==============+==========+=========== > > > vq_group | 0 | 1 > > > vq_desc_group | 2 | 1 > > > > > > > > > --- > > > > > > Si-Wei Liu (3): > > > vdpa: introduce dedicated descriptor group for virtqueue > > > vhost-vdpa: introduce descriptor group backend feature > > > vhost-vdpa: uAPI to get dedicated descriptor group id > > > > Looks good to me but I'd expect example implementations in the parent. > > > We (Si-Wei and I) will send a non-RFC series with the mlx5_vdpa implementation > as soon as the submission window opens. > > Can we add your Acked-by for these core patches? Yes. Thanks > > Thanks, > Dragos _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
