- vhost-user:vhost不断去poll virtqueue,省去了通知的开销 如果是写云盘,之后两者也没有区别,但是vhost-user在线程模型上更具优势;如果是写本地盘,vhost-user的另一个优势: - qemu-virtio:在qemu中写本地nvme盘,数据会拷贝到内核,再由内核的nvme驱动写盘,写完后由中断通知内核 - vhost-user:通过vhost实现的...
较之内核(诸如Linux Kernel) 的NVMe驱动,它可以大幅度降低NVMe command的延迟 (Latency) ,同时提高单CPU核的IOPS,从而形成一套高性价比的解决方案,例如使用SPDK的vhost解决方案可以应用于HCI (Hyper Converged Infrastructure) 加速虚拟机中的NVMe I/O。 为了实现上述目标,仅仅提供用户态NVMe驱动的一些操作函数或源语...
网络仿真 https://www.qemu.org/docs/master/system/devices/net.html NVMe 仿真 https://www.qemu.org/docs/master/system/devices/nvme.html USB 仿真 https://www.qemu.org/docs/master/system/devices/usb.html 虚拟主机用户后端 https://www.qemu.org/docs/master/system/devices/vhost-user.html virtio ...
This way, the guest would first attempt to boot from the disk scsi0, if that fails, it would go on to attempt network boot from net0, and in case that fails too, finally attempt to boot from a passed through PCIe device (seen as disk in case of NVMe, otherwise tries to launch int...
NVMe 仿真 https://www.qemu.org/docs/master/system/devices/nvme.html USB 仿真 https://www.qemu.org/docs/master/system/devices/usb.html 虚拟主机用户后端 https://www.qemu.org/docs/master/system/devices/vhost-user.html virtio pmem https://www.qemu.org/docs/master/system/devices/virtio-pmem....
二. SPDK vhost的基本原理 SPDK(Storage Performance Development Kit )提供了一组用于编写高性能、可伸缩、用户态存储应用程序的工具和库,基本组成分为用户态、轮询、异步、无锁 NVMe 驱动,提供了从用户空间应用程序直接访问SSD的零拷贝、高度并行的访问。
1.启动vhost application: ./app/vhost/vhost -S /var/tmp -s 1024 -m 0x3 & 2. 创建SPDK bdev (注意:SPDK bdev是SPDK中对多种存储后端(storage backend)的抽象。 这些存储后端(storage backend)包括:ceph RBD,ramdisk,NVMe,iSCSI,逻辑卷,甚至是virtio)。这里就体现了SPDK block device layer的概念。
.name = "vhost", .type = QEMU_OPT_BOOL, .help = "enable vhost-net network accelerator", }, { .name = "vhostfd", .type = QEMU_OPT_STRING, .help = "file descriptor of an already opened vhost net device", }, { .name = "vhostforce", .type = QEMU_OPT_BOOL, ...
-netdev tap,fd=32,id=hostnet0,vhost=on,vhostfd=37 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:d1:2d:99,bus=pci.0,addr=0x3 -chardev file,id=charserial0,path=/var/lib/nova/instances/1f8e6f7e-5a70-4780-89c1-464dc0e7f308/console.log ...
libblkio 1.0 版本提供了 Linux io_uring 用在文件 I/O 上的功能,主要使用了 NVMe io_uring cmd 来做 NVMe 基准测试,使用了 virtio-blk(vhost-user 和 vhost-vdpa)来连接到 qemu-store-daemon 并访问 vdpa-blk 设备。这样选择下来的驱动使得这个函数库既可用于连接 qemu-storage-daemon,也可用于直接访问文件...