On Wed, Jan 30, 2013 at 07:12:19PM +0800, Jason Wang wrote: > Hello all: > > This seires is an update of last version of multiqueue virtio-net support. > > This series tries to brings multiqueue support to virtio-net through a > multiqueue support tap backend and multiple vhost threads. > > Patch 1 converts bitfield in TAPState to bool. Patch 2 replace assert(0) with > abort() in tap. > > To support this, multiqueue nic support were added to qemu. This is done by > introducing an array of NetClientStates in NICState, and make each pair of > peers > to be an queue of the nic. This is done in patch 3-9. > > Tap were also converted to be able to create a multiple queue > backend. Currently, only linux support this by issuing TUNSETIFF N times with > the same device name to create N queues. Each fd returned by TUNSETIFF were a > queue supported by kernel. Three new command lines were introduced, "queues" > were used to tell how many queues will be created by qemu; "fds" were used to > pass multiple pre-created tap file descriptors to qemu; "vhostfds" were used > to > pass multiple pre-created vhost descriptors to qemu. This is done in patch > 10-15. > > A method of deleting a queue and queue_index were also introduce for virtio, > this is done in patch 16-17. > > Vhost were also changed to support multiqueue by introducing a start vq index > which tracks the first virtqueue that will be used by vhost instead of the > assumption that the vhost always use virtqueue from index 0. This is done in > patch 18. > > The last part is the multiqueue userspace changes, this is done in patch > 19-22. > > With this changes, user could start a multiqueue virtio-net device through > > ./qemu -netdev tap,id=hn0,queues=2,vhost=on -device virtio-net-pci,netdev=hn0 > > Management tools such as libvirt can pass multiple pre-created fds/vhostfds > through > > ./qemu -netdev tap,id=hn0,fds=X:Y,vhostfds=M:N -device > virtio-net-pci,netdev=hn0 > > For the one who wants to try, a git tree is available at: > git://github.com/jasowang/qemu.git > > Changes from V3: > - convert bitfield to bool in TAPState (Blue) > - use abort() instead of assert(0) in tap code (Blue) > - rebase to the latest > - fix a bug that breaks the non-tap network
This conflicts with the pull request I sent, in partucular this adds a layout assumption. In the hope this will accelerate things, I did a rebase and a trivial test with single queue only and it seems ok: git://github.com/mstsirkin/qemu.git pci There were some warnings about whitespace at EOF but otherwise seems ok. -- MST
