docs: Update vhost-user-blk-testing.md
The purpose is to add more info while running
spdk vhost tgt. For example, adding more info
(total_size, block_size) to describe the meaning
on creating malloc bdev inside spdk vhost tgt.
@@ -69,12 +69,16 @@ make
```
### Set the SPDK environment
+
+Run SPDK vhost target with 2 CPU cores, i.e., core 0 and 1.
```bash
sudo HUGEMEM=2048 scripts/setup.sh
sudo ./build/bin/vhost -S /var/tmp -s 1024 -m 0x3 &
```
### Create 512M block device
+
+Create a 512M (first parameter) block device with 512 bytes (second parameter) block size.
```bash
sudo scripts/rpc.py bdev_malloc_create 512 512 -b Malloc0
sudo scripts/rpc.py vhost_create_blk_controller --cpumask 0x1 vhost.1 Malloc0
