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 ...
- 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...
由于需要实现 vhost-user-blk 和其他访问 qemu-store-daemon export 协议,所以如果有这么一个库提供这个功能,就很方便了,可以省去应用程序的重复工作。 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 vh...
“我现在想在磁盘上存储此数据”时,virtio-blk,Qemu和Ceph将一起工作,只有在写入完成时才会报告 写入主OSD 复制到可用的副本OSD 只是写入所有的osd...将 all-flash OSDs 放入独立的CRUSH root 假设你不是在全闪存硬件上运行,而是运行一个经济高效的混合集群,其中一些OSD是普通的,而其他是SSD(或NVMe设备或其他)...
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....
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。
- hw/nvme: fix -Werror=maybe-uninitialized - block/virtio-blk: Fix memory leak from virtio_blk_zone_report - hw/net/virtio-net: fix qemu set used ring flag even vhost started - hw/scsi/scsi-generic: Fix io_timeout property not applying ...
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...
.params = "[user|tap|socket|vde|bridge|hubport|netmap|vhost-user],id=str[,prop=value][,...]", .help = "add host network device", .cmd = hmp_netdev_add, .command_completion = netdev_add_completion, }, STEXI @item netdev_add @findex netdev_add Add host network de...