Supported troubleshooting scenarios include quick checks on known issues and best practices, and complex problems that involve slow VM performance or high usage of CPU, disk space, or memory. Performance diagnostics for Azure virtual machines: The performance diagnostics tool helps you troubleshoot performance issues that can affect a Windows or Linux virtual machine (VM). Troubleshoot high-CPU issues for Azure Windows virtual machinesĬhart performance with Azure Monitor for VMs Troubleshoot Azure virtual machine performance on Linux or Windows: This article describes virtual machine (VM) generic performance troubleshooting through monitoring and observing bottlenecks and provides possible remediation for issues that may occur. There are three places in an Azure VM where the IO can be blocked. The blocking IOs is not due to a physical limit, but rather is due to a software limit which we call "throttling". This causes the IOs to be processed slower and some IOs are blocked until the previous IOs are processed If the high CPU is persistent or reoccurring, we need more information (data collection), We need to use tools like Perfinsights to capture data, Also we need to understand any throttling due to IOPS or VM limits.Īssuming sometimes Storage performance issues are mainly due to blocking IOs, which means the application sends more IO than the storage can handle. If this is the case, give me some tips to mitigate the performance Welcome to Microsoft Q&A Platform. Thus I would like to ask whether VM had some limitations that cap specific type of resources intensive application's CPU usage to prevent it from crashing? If this is not the case, please tell me the genuine reason. Moreover, the CPU usage of VM seemed never go over 50% even there is more VPN users, but for other applications, it is possible for CPU to went over 40-50%. In comparison, I also run VPN server at my home using home network and my new laptop, it ran well even when CPU is nearly 100%. When I check the CPU usage, I found that the CPU usage is only about 40%, which was not high. The server is in India, while I am in hong kong, the expected latency is about 100ms, however sometimes the ping can went to 2000ms(note that my home network and my PC is totally normal). However, when I test the performance of the server using my computer, I found the latency extremely high, here is the transcript of the traceroute to 9.9.9.9 using my computer which connected to the VPN in the VMħ 1453 ms 722 ms 2331 ms .msn.net Ĩ 1145 ms 146 ms 648 ms .msn.net ĩ 495 ms 274 ms 185 ms .msn.net ġ0 215 ms 206 ms 342 ms .msn.net ġ2 1646 ms 849 ms 771 ms I run a VPN server on the azure cloud VM, the server is opened for public use with about 100 users.
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