On Tue, Aug 30, 2022 at 06:22:31AM +0000, Eli Cohen wrote: > > > Hi, > > > > I have been experimenting with different queue sizes with mlx5_vdpa and noticed > that queue size can affect performance. > > I would like to propose an extension to vdpa tool to allow to specify the queue > size. Valid values will conform to the max of 32768 specified by the spec. > > > > “vdpa mgmtdev show” will have another line specifying the valid range for a > management device which could be narrower than the spec allows. This range will > be valid for data queues only (not for control VQ). > > Another line will display the default queue size > > > > Example: > > $ vdpa mgmtdev show > > auxiliary/mlx5_core.sf.6: > > supported_classes net > > max_supported_vqs 65 > > dev_features CSUM GUEST_CSUM MTU HOST_TSO4 HOST_TSO6 STATUS CTRL_VQ CTRL_VLAN > MQ CTRL_MAC_ADDR VERSION_1 ACCESS_PLATFORM > > data queue range 256-4096 > > default queue size 256 > > > > When you create the vdpa device you can specify the requested value: > > $ vdpa dev add name vdpa-a mgmtdev auxiliary/mlx5_core.sf.6 max_vqp 1 mtu 9000 > queue_size 1024 > > A follow up question: isn't it enough to control the size from qemu? do we need ability to control it at the kernel level? -- MST _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
