TLDR
- CPU 运算性能难以区分
- kvm 使用 virtio + writeback 性能尚可，除了连续写入之外都略输 vbox
- kvm 使用 virtio + none 性能十分可怜
- 宿主机 cpufreq governor 使用 ondemand 时，kvm 被大幅削弱 （I/O 数字降为 performance 的一半，superPI 1M 58秒），vbox 没影响
[Host]
AMD Kabini APU with Radeon™ Graphics
Western Digital WD10SPZX 1TB 5400rpm 128MB
Linux 4.9.0-4-amd64 #1 SMP Debian 4.9.51-1
qemu-kvm 1:2.8+dfsg-6+deb9u3
virtualbox-5.2 5.2.0-118431~Debian~stretch
cpufreq_governor performance
[Guest]
Windows XP Professional Service Pack 3
QEMU/KVM virtio, raw, prealloc=full
VirtualBox SATA, VMDK, dynamic
[Super_PI Mod 1.9 WP]
1M, 19 loops
5 rounds, second(s), lower is better
| Hypervisor | Rnd1 | Rnd2 | Rnd3 | Rnd4 | Rnd5 |
|---|---|---|---|---|---|
| QEMU/KVM | 51.453 | 52.172 | 51.938 | 51.875 | 51.515 |
| VirtualBox | 51.965 | 52.395 | 52.275 | 52.366 | 52.165 |
[CrystalDiskMark 5.2.2]
5, 1GB, Q32T1
5 rounds, MB/s, higher is better
-
QEMU/KVM(writeback)
| Rnd | Seq Q32T1 | 4K Q32T1 | Seq | 4K |
|---|---|---|---|---|
| R1 | 213.4 | 11.32 | 436.6 | 9.832 |
| R2 | 217.7 | 11.55 | 430.2 | 9.534 |
| R3 | 192.4 | 11.08 | 453.4 | 9.367 |
| R4 | 188.6 | 10.76 | 441.0 | 9.439 |
| R5 | 210.0 | 11.00 | 421.7 | 9.328 |
| Rnd | Seq Q32T1 | 4K Q32T1 | Seq | 4K |
|---|---|---|---|---|
| W1 | 148.3 | 10.30 | 144.0 | 8.712 |
| W2 | 152.3 | 10.62 | 140.5 | 8.840 |
| W3 | 145.3 | 10.43 | 145.4 | 8.881 |
| W4 | 146.4 | 10.54 | 149.8 | 9.145 |
| W5 | 146.9 | 10.47 | 150.2 | 8.932 |
-
QEMU/KVM(none)
| Rnd | Seq Q32T1 | 4K Q32T1 | Seq | 4K |
|---|---|---|---|---|
| R1 | 85.66 | 0.925 | 81.51 | 0.348 |
| R2 | 91.55 | 1.117 | 90.69 | 0.419 |
| R3 | 87.20 | 1.001 | 83.07 | 0.396 |
| R4 | 85.79 | 1.022 | 84.14 | 0.377 |
| R5 | 94.44 | 1.063 | 88.92 | 0.398 |
| Rnd | Seq Q32T1 | 4K Q32T1 | Seq | 4K |
|---|---|---|---|---|
| W1 | 60.63 | 0.451 | 76.69 | 0.458 |
| W2 | 66.44 | 0.463 | 77.65 | 0.473 |
| W3 | 74.31 | 0.425 | 75.05 | 0.446 |
| W4 | 57.69 | 0.463 | 79.11 | 0.468 |
| W5 | 62.68 | 0.438 | 79.48 | 0.456 |
-
VirtualBox(Host I/O Cache)
| Rnd | Seq Q32T1 | 4K Q32T1 | Seq | 4K |
|---|---|---|---|---|
| R1 | 323.7 | 18.13 | 383.8 | 12.92 |
| R2 | 210.9 | 18.31 | 388.1 | 12.99 |
| R3 | 326.0 | 18.35 | 382.0 | 13.11 |
| R4 | 326.9 | 18.55 | 367.0 | 13.05 |
| R5 | 324.6 | 18.33 | 361.9 | 13.23 |
| Rnd | Seq Q32T1 | 4K Q32T1 | Seq | 4K |
|---|---|---|---|---|
| W1 | 83.24 | 16.69 | 115.5 | 12.68 |
| W2 | 85.68 | 16.85 | 91.84 | 12.07 |
| W3 | 88.08 | 17.24 | 83.63 | 12.00 |
| W4 | 90.17 | 17.74 | 81.95 | 11.99 |
| W5 | 97.66 | 17.86 | 90.81 | 12.47 |
-
VirtualBox(none)
| Rnd | Seq Q32T1 | 4K Q32T1 | Seq | 4K |
|---|---|---|---|---|
| R1 | 346.4 | 17.67 | 389.8 | 13.06 |
| R2 | 328.7 | 18.21 | 372.8 | 13.17 |
| R3 | 308.8 | 17.67 | 357.6 | 13.03 |
| R4 | 319.2 | 18.01 | 375.1 | 13.07 |
| R5 | 313.6 | 18.13 | 374.2 | 12.97 |
| Rnd | Seq Q32T1 | 4K Q32T1 | Seq | 4K |
|---|---|---|---|---|
| W1 | 108.0 | 16.00 | 83.92 | 12.44 |
| W2 | 87.63 | 17.80 | 84.89 | 12.42 |
| W3 | 83.97 | 17.93 | 88.70 | 12.32 |
| W4 | 83.32 | 16.82 | 80.06 | 12.40 |
| W5 | 82.14 | 17.26 | 88.64 | 12.18 |