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如何在同一（区域）VNET上的两个Azure VM（ARM）之间获得亚毫秒级延迟？

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我可以在同一个Cloud Service中的两个Standard_D2_V2 West Europe Classic（ASM）VM之间获得亚毫秒级延迟，并将 Cloud 服务分配给一个关联组 .

我还可以在Azure VM Scale Set中的VM之间获得亚毫秒级延迟 .

但我似乎无法在两个Azure ARM VM（共享相同（区域）VNET）之间获得亚毫秒级延迟 . 有没有一种方法可以在ARM VM之间可靠地获得亚毫秒级延迟而无需像Azure classic / ASM中的关联组一样部署为Scale Set？

以下是我对各种场景的测量 . 我已多次部署各种方案，以便尽可能地排除幸运与不幸的部署 .

Two ASM(classic) VMs in same cloud service assigned to an affinity group (not connected via VNET!!)

PS C:\Users\simon> .\psping -l 1k -n 10000 -h 13.81.205.180:60123

PsPing v2.10 - PsPing - ping, latency, bandwidth measurement utility
Copyright (C) 2012-2016 Mark Russinovich
Sysinternals - www.sysinternals.com

TCP latency test connecting to 13.81.205.180:60123: Connected
10005 iterations (warmup 5) sending 1024 bytes TCP latency test: 100%

TCP roundtrip latency statistics (post warmup):
  Sent = 10000, Size = 1024, Total Bytes: 10240000,
  Minimum = 0.11ms, Maxiumum = 6.23ms, Average = 0.45ms

Latency Count
0.11    6042
0.43    2721
0.75    846

Azure ARM VM Scale Set VMs

PS C:\Users\simon> .\psping -l 1k -n 20000 -h 10.0.0.7:60123

TCP roundtrip latency statistics (post warmup):
  Sent = 20000, Size = 1024, Total Bytes: 20480000,
  Minimum = 0.18ms, Maxiumum = 9.62ms, Average = 0.48ms

Latency Count
0.18    19733
0.68    178

Azure ARM VM to Azure ARM VM on same (regional) vnet

PS C:\Users\simon> .\psping -l 1k -n 20000 -h 10.0.0.7:60123

TCP roundtrip latency statistics (post warmup):
  Sent = 20000, Size = 1024, Total Bytes: 20480000,
  Minimum = 1.59ms, Maxiumum = 10.60ms, Average = 1.81ms

Latency Count
1.59    19401
2.07    379
2.54    98
azure

1 回答

  • 1

    Igor Pagliai（@igorpag）在twitter上给了我以下建议：

    "If not possible to use VM with RDMA, you can try with VM in same Availability Set. Something new will come soon in Azure."以及https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-accelerated-networking-portal

    我提出了他的可用性集建议，并创建了一个具有单个故障域的可用性集，门户网站为故障域提供了以下工具提示“同一故障域中的虚拟机共享一个共同的......物理网络交换机 . ”，这听起来很响亮非常有希望，结果没有让人失望：

    Azure ARM VMs same availability set/fault domain (sub millisecond latency, yippee!)

    PS C:\Users\simon> .\psping -l 1k -n 10000 -h 10.0.0.4:60123

TCP roundtrip latency statistics (post warmup):
  Sent = 10000, Size = 1024, Total Bytes: 10240000,
  Minimum = 0.13ms, Maxiumum = 7.93ms, Average = 0.22ms

Latency Count
0.13    9742
0.54    194
0.95    55
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