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Virtio ring and virtio-net
Michael S Tsirkin Red Hat news case study challenges
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Virtio with kvm Guest virtio Guest KVM eventfd Vhost qemu
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io Guest virtio Guest KVM eventfd Vhost qemu
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interrupt Guest virtio Guest KVM eventfd Vhost qemu
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virtio-test Guest test virtio KVM eventfd Vhost qemu
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poll test virtio eventfd Vhost
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write test virtio eventfd Vhost
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linux/tools/virtio # vi drivers/virtio/virtio.c ....
# cd tools/virtio/ ; make -q # insmod vhost_test/vhost_test.ko # time ./virtio_test real 0m0.649s user 0m0.295s sys 0m0.335s
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Virtio ring Avail Desc Used Guest Vhost !
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window ! ! Used Guest Vhost
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Event index ! ! Used Guest Vhost !
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Extending virtio test Guest virtio KVM eventfd Vhost qemu 31 30 29 28
27-0 features test Guest virtio KVM eventfd Vhost qemu
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linux/tools/virtio # time ./virtio_test --no-event-idx real 0m0.649s
user 0m0.295s sys 0m0.335s # time ./virtio_test --event-idx real 0m0.169s user 0m0.140s sys 0m0.019s
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virtio-net TX Guest KVM Vhost macvtap NIC
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Zcopy TX Guest KVM Vhost macvtap NIC
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Guest -> External 10 Gb/s 64K 4K 64K 4K 2K 2K
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Filtering :80 :22 Guest :80? KVM Vhost tap bridge NIC
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Partial copy Guest :22 :80 :80? KVM Vhost tap bridge skbuff NIC
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Zcopy RX Guest B tap KVM Vhost Guest KVM Vhost tap bridge NIC ?
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Guest 2 Guest Guest A Guest B KVM Vhost tap bridge tap Vhost KVM NIC
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multiqueue Guest TX RX TX RX Macvtap TX RX TX RX ? NIC TX RX TX RX
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External -> Guest 10 Gb/s 4 8 512b 4 8 2 2
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Status/TODO Virtio ring + Zero copy TX + Multiqueue + Zero copy RX ?
Bridge zero copy ? Level interrupts ?
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Questions?
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Virtio ring Avail Desc Used Guest Vhost
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