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105 lines
3.9 KiB
Markdown
105 lines
3.9 KiB
Markdown
# How to test vhost-user-blk with SPDK
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The purpose of this document is to illustrate how to test vhost-user-blk in Cloud Hypervisor with SPDK as the backend.
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## Framework
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It's a simple test to validate the block read/write between VM and block backend.
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```
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+----+----------+ +-------------+-----------+
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| | | | | |
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| |vhost-user|----------| vhost-user | dpdk |
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| |blk device| | port 1 | |
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| | | | | |
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| +----------+ +-------------+-----------+
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| vm | | spdk |
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| | | |
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+--+----------------------------------------------------+--+
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| | hugepages | |
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| +----------------------------------------------------+ |
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| host |
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+----------------------------------------------------------+
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```
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## Prerequisites
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Prior to running the test, the following steps need to be performed.
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- Enable hugepages
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- Install SPDK
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Here are some good references for detailing them.
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- spdk
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* https://spdk.io/doc/
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## Test environment
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The below test environment is based on ubuntu release(16.04.1 LTS), as for other system, please check related document.
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The test runs with multiple queue (MQ) support enabled, using 4 queues defined for both SPDK and the virtual machine.
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Here are the details on how the test can be run.
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### The hugepages settings in host linux
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Add "default_hugepagesz=1G hugepagesz=1G hugepages=2" into host linux cmdline.
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As for how to change Ubuntu linux cmdline in grub file, please ref below link:
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https://www.ostechnix.com/configure-grub-2-boot-loader-settings-ubuntu-16-04/
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reboot Ubuntu
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sudo mount -t hugetlbfs -o pagesize=1G none /dev/hugepages
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### Download the SPDK code
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git clone https://github.com/spdk/spdk
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cd spdk
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git submodule update --init
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### Create the build dep
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./scripts/pkgdep.sh
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### Build spdk
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./configure
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make
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### Set the SPDk environment
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sudo HUGEMEM=2048 scripts/setup.sh
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sudo ./app/vhost/vhost -S /var/tmp -s 1024 -m 0x3 &
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### Create 512M block device
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sudo scripts/rpc.py bdev_malloc_create 512 512 -b Malloc0
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sudo scripts/rpc.py vhost_create_blk_controller --cpumask 0x1 vhost.1 Malloc0
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_Launch the VM_
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VMs run in client mode. They connect to the socket created by the `dpdkvhostuser` in the SPDK backend.
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```bash
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# From the test terminal. We need to create one vhost-user-blk device for the --disk.
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./cloud-hypervisor \
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--cpus boot=4 \
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--memory size=1024M,hugepages=on,shared=true \
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--kernel linux/arch/x86/boot/compressed/vmlinux.bin \
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--cmdline "console=ttyS0 root=/dev/vda1 rw iommu=off" \
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--disk path=images/focal-server-cloudimg-amd64.raw vhost_user=true,socket=/var/tmp/vhost.1,num_queues=4,queue_size=128 \
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--console off \
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--serial tty \
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--rng
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```
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```bash
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# How to test the vhost-user-blk device with SPDK backend
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login in guest
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# Use lsblk command to find out vhost-user-blk device
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lsblk
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NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
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vda 252:0 0 2.2G 0 disk
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├─vda1 252:1 0 2.1G 0 part /
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├─vda14 252:14 0 4M 0 part
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└─vda15 252:15 0 106M 0 part /boot/efi
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vdb 253:16 0 512M 0 disk
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The vhost-user-blk device is /dev/vdb
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# How to do simple read/write test
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dd if=/dev/vdb of=/dev/null bs=2M iflag=direct
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dd of=/dev/vdb if=/dev/zero bs=2M oflag=direct count=256
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If you want to do fio test, please install fio binary into guest. The detailed info is not listed here.
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