Ring和共享内存

DPDK Ring

DPDK Ring提供了一个FIFO无锁队列,支持丰富的队列操作,比如
    Multi-consumer or single-consumer dequeue
    Multi-producer or single-producer enqueue
    Bulk dequeue - Dequeues the specified count of objects if successful; otherwise fails
    Bulk enqueue - Enqueues the specified count of objects if successful; otherwise fails
    Burst dequeue - Dequeue the maximum available objects if the specified count cannot be fulfilled
    Burst enqueue - Enqueue the maximum available objects if the specified count cannot be fulfilled

ivshmem

ivshmem则通过把内存映射成虚拟机PCI设备提供了虚拟机间(host-to-guest or guest-to-guest)共享内存的机制。
DPDK ivshmem:

ivshmem使用示例

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# on the host
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mount tmpfs /dev/shm -t tmpfs -osize=32m
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ivshmem_server -m 64 -p/tmp/nahanni &
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# start VM
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qemu-system-x86_64 -hda mg -L /pc-bios/ --smp 4 –chardev socket,path=/tmp/nahanni,id=nahanni-device ivshmem,chardev=nahanni,size=32m,msi=off -serial telnet:0.0.0.0:4000,server,nowait,nodelay-enable-kvm&
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# inside VM
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modprobe kvm_ivshmem
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cat/proc/devices | grep kvm_ivshmem
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mknod-mode=666 /dev/ivshmem c 245 0
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最近更新 3yr ago