实验记录，kvm嵌套性能损失

无聊的小实验，权且记录下kvm嵌套的性能损失。

宿主kvm机器

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#              Yet-Another-Bench-Script              #
#                     v2023-04-23                    #
# https://github.com/masonr/yet-another-bench-script #
# ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## #

Mon Apr 24 09:02:41 UTC 2023

Basic System Information:
---------------------------------
Uptime     : 1 days, 19 hours, 41 minutes
Processor  : AMD Ryzen 9 7950X3D 16-Core Processor
CPU cores  : 8 @ 4192.108 MHz
AES-NI     : ✔ Enabled
VM-x/AMD-V : ✔ Enabled
RAM        : 31.4 GiB
Swap       : 0.0 KiB
Disk       : 295.2 GiB
Distro     : Debian GNU/Linux 11 (bullseye)
Kernel     : 5.10.0-21-cloud-amd64
VM Type    : KVM
IPv4/IPv6  : ✔ Online / ❌ Offline

IPv4 Network Information:
---------------------------------
ISP        : Hetzner Online GmbH
ASN        : AS24940 Hetzner Online GmbH
Host       : Hetzner
Location   : Frankfurt am Main, Hesse (HE)
Country    : Germany

fio Disk Speed Tests (Mixed R/W 50/50):
---------------------------------
Block Size | 4k            (IOPS) | 64k           (IOPS)
  ------   | ---            ----  | ----           ----
Read       | 572.86 MB/s (143.2k) | 5.85 GB/s    (91.5k)
Write      | 574.37 MB/s (143.5k) | 5.88 GB/s    (92.0k)
Total      | 1.14 GB/s   (286.8k) | 11.74 GB/s  (183.5k)
           |                      |
Block Size | 512k          (IOPS) | 1m            (IOPS)
  ------   | ---            ----  | ----           ----
Read       | 4.31 GB/s     (8.4k) | 4.67 GB/s     (4.5k)
Write      | 4.54 GB/s     (8.8k) | 4.98 GB/s     (4.8k)
Total      | 8.86 GB/s    (17.3k) | 9.66 GB/s     (9.4k)

iperf3 Network Speed Tests (IPv4):
---------------------------------
Provider        | Location (Link)           | Send Speed      | Recv Speed      | Ping
-----           | -----                     | ----            | ----            | ----
Clouvider       | London, UK (10G)          | busy            | 928 Mbits/sec   | 23.7 ms
Scaleway        | Paris, FR (10G)           | 936 Mbits/sec   | 924 Mbits/sec   | 24.9 ms
NovoServe       | North Holland, NL (40G)   | 940 Mbits/sec   | 922 Mbits/sec   | 10.5 ms
Uztelecom       | Tashkent, UZ (10G)        | busy            | 481 Mbits/sec   | 89.9 ms
Clouvider       | NYC, NY, US (10G)         | 624 Mbits/sec   | 200 Mbits/sec   | 162 ms
Clouvider       | Dallas, TX, US (10G)      | 750 Mbits/sec   | 415 Mbits/sec   | 129 ms
Clouvider       | Los Angeles, CA, US (10G) | 598 Mbits/sec   | 331 Mbits/sec   | 158 ms

Geekbench 6 Benchmark Test:
---------------------------------
Test            | Value
                |
Single Core     | 2684
Multi Core      | 12500
Full Test       | https://browser.geekbench.com/v6/cpu/1028715

YABS completed in 6 min 25 sec

nested kvm机器

IO性能大幅下降，CPU性能下降倒是不很多。
一般是不会在虚拟机内部再嵌套开虚拟机，磁盘性能下降得不偿失。
在虚拟机内开容器倒是挺常见的，尤其是openvz7目前以完整系统套件发布，打包到虚拟机内不会给最外层机器造成太多束缚。

# ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## #
#              Yet-Another-Bench-Script              #
#                     v2023-04-23                    #
# https://github.com/masonr/yet-another-bench-script #
# ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## ## #

Mon 24 Apr 2023 09:45:43 AM UTC

Basic System Information:
---------------------------------
Uptime     : 0 days, 0 hours, 0 minutes
Processor  : AMD Ryzen 9 7950X3D 16-Core Processor
CPU cores  : 8 @ 4192.108 MHz
AES-NI     : ✔ Enabled
VM-x/AMD-V : ✔ Enabled
RAM        : 3.5 GiB
Swap       : 0.0 KiB
Disk       : 3.8 GiB
Distro     : Debian GNU/Linux 11 (bullseye)
Kernel     : 5.10.0-21-amd64
VM Type    : QEMU
IPv4/IPv6  : ✔ Online / ❌ Offline

IPv4 Network Information:
---------------------------------
ISP        : Hetzner Online GmbH
ASN        : AS24940 Hetzner Online GmbH
Host       : Hetzner
Location   : Frankfurt am Main, Hesse (HE)
Country    : Germany

fio Disk Speed Tests (Mixed R/W 50/50):
---------------------------------
Block Size | 4k            (IOPS) | 64k           (IOPS)
  ------   | ---            ----  | ----           ----
Read       | 120.97 MB/s  (30.2k) | 808.21 MB/s  (12.6k)
Write      | 121.29 MB/s  (30.3k) | 812.46 MB/s  (12.6k)
Total      | 242.27 MB/s  (60.5k) | 1.62 GB/s    (25.3k)
           |                      |
Block Size | 512k          (IOPS) | 1m            (IOPS)
  ------   | ---            ----  | ----           ----
Read       | 4.62 GB/s     (9.0k) | 5.11 GB/s     (4.9k)
Write      | 4.86 GB/s     (9.5k) | 5.45 GB/s     (5.3k)
Total      | 9.48 GB/s    (18.5k) | 10.56 GB/s   (10.3k)

iperf3 Network Speed Tests (IPv4):
---------------------------------
Provider        | Location (Link)           | Send Speed      | Recv Speed      | Ping
-----           | -----                     | ----            | ----            | ----
Clouvider       | London, UK (10G)          | 933 Mbits/sec   | 842 Mbits/sec   | 24.0 ms
Scaleway        | Paris, FR (10G)           | 935 Mbits/sec   | 934 Mbits/sec   | 25.0 ms
NovoServe       | North Holland, NL (40G)   | 940 Mbits/sec   | 936 Mbits/sec   | 10.7 ms
Uztelecom       | Tashkent, UZ (10G)        | 490 Mbits/sec   | 571 Mbits/sec   | 90.0 ms
Clouvider       | NYC, NY, US (10G)         | 591 Mbits/sec   | 193 Mbits/sec   | 162 ms
Clouvider       | Dallas, TX, US (10G)      | 545 Mbits/sec   | 386 Mbits/sec   | 130 ms
Clouvider       | Los Angeles, CA, US (10G) | 554 Mbits/sec   | busy            | 158 ms

Geekbench 6 Benchmark Test:
---------------------------------
Test            | Value
                |
Single Core     | 2521
Multi Core      | 10431
Full Test       | https://browser.geekbench.com/v6/cpu/1029034