[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC)：2025-09-04。"],[],[],null,["# Performance diagnostics use cases\n\nThis page describes how Performance Dashboard can help you diagnose\nperformance issues in a Google Cloud project. The following sections\ndescribe commonly observed performance issues and their root causes.\n\nPerformance diagnostics: Is it the project or Google Cloud?\n-----------------------------------------------------------\n\nYou observe latency or packet loss values in your project, and you want to\nvalidate and compare against reference data outside of your projects. The\n**Performance for all of Google Cloud** view in Performance Dashboard\nlets you correlate per-project network\nperformance, such as VM-to-VM packet loss or latency, to performance over all of\nGoogle Cloud, to show packet loss and latency across all relevant\nGoogle Cloud infrastructure.\n\nIn the following example, you can see that Google Cloud traffic experienced\npacket loss recently. By holding the pointer over the chart, you can see that\nthe peak loss occurred between `asia-east1-a` and `asia-northeast3-b` at 2:26 PM.\nIf your project's issues correspond to this time and location, you save\ntroubleshooting time because the issues impact all of Google Cloud.\n[](/static/network-intelligence-center/docs/performance-dashboard/images/gcpd-pl-summary.png) Packet loss summary (click to enlarge)\n\nHolding the pointer over a time series shows data for the source and destination.\nTo show the chart legend, you click the **Show Legend** button on the time series\nchart. Holding the pointer over a zone pair in the legend highlights the time series\ndata for that pair.\n[](/static/network-intelligence-center/docs/performance-dashboard/images/gcpd-pl-ts-highlights.png) Packet loss time series highlights (click to enlarge)\n\nTo see all the areas where the packet loss issue occurred at 2:26 PM, you update the\nheatmap by moving the time selector on the time series chart.\n\n### Scenario: Validate if the project performance differs from Google Cloud\n\nUsing the per-project Performance Dashboard in the Network Intelligence Center, you\nidentified a region or zone pair with high latency or packet loss.\nYou want to see if they differ significantly from the Google Cloud average.\n\nHold the pointer over the region or zone pair that you want to validate. You can see\nthe value of latency or packet loss for your project and the value of the\nGoogle Cloud average for the same pair underneath. If they are similar,\nit indicates that the performance observed in your projects is similar to the\naverage across all projects within the same region or zone pair.\n\n### Scenario: Investigate current high latency or packet loss issue\n\nYou identified the region or zone pairs with high packet loss or latency,\nand you want to compare those with the overall Google Cloud values. You can\nrefine the Google Cloud performance view of Performance Dashboard by\nusing the source and destination region selection capability. There are two ways\nin which you can refine the Google Cloud performance view:\n\n- To view data for specific regions, you select the regions from the **Locations**\n menu. You can select up to five regions.\n\n- To view zone-to-zone data for a region pair, you click the square in the\n regional heatmap that corresponds to the region pair.\n\n [](/static/network-intelligence-center/docs/performance-dashboard/images/gpd-lat-loca-heatmap-blue.png) Regional heatmap (click to enlarge)\n\nWith both selection methods, the time series data and heatmap for the\nselected pairs are displayed. In the following example, you selected\n`asia-east1` and `europe-north1`.\n[](/static/network-intelligence-center/docs/performance-dashboard/images/gcpd-lat-ts-hm-blue.png) Timeseries and heatmap for selected pairs (click to enlarge)\n\n### Scenario: Investigate historic high latency or packet loss issue\n\nIf you want to investigate a specific time slot in which you observed abnormal\nlatency or packet loss values, you can use the time zoom in the time series. In\nthis example, you have selected 30 days.\n[](/static/network-intelligence-center/docs/performance-dashboard/images/gcpd-lat-summary.png) Latency summary (click to enlarge)\n\nYou can further refine the time selection by clicking and dragging on the time\nseries chart to select the days or hours related to your investigation.\n\nThe chart displays the data for Monday the 9th through Friday the 13th. You can\npinpoint a modest spike in latency on November 11 at 8:15 AM.\n[](/static/network-intelligence-center/docs/performance-dashboard/images/gcpd-lat-summary-zoom.png) Latency summary time zoom (click to enlarge)\n\nWhat's next\n-----------\n\n- [Project performance use cases](/network-intelligence-center/docs/performance-dashboard/concepts/use-cases-project)\n- [Planning for performance across geographies use cases](/network-intelligence-center/docs/performance-dashboard/concepts/use-cases-performance-across-geographies)\n- [Planning for performance use cases](/network-intelligence-center/docs/performance-dashboard/concepts/use-cases-workload-optimization)\n- [View project-specific packet loss dashboard](/network-intelligence-center/docs/performance-dashboard/how-to/view-project-specific-packet-loss)\n- [Troubleshoot Performance Dashboard](/network-intelligence-center/docs/performance-dashboard/support/troubleshooting)"]]
